Implement [40K] Squad ability (#10509)

* First try at Squad Mechanic

* Fully functional now, removed cards from unfinished list in 40k

* Improved implementation, removing the generic conditional
and replacing it with a separated ETB trigger and effect.

* Add tests from Susucre (using Strionic Resonator for now, two others currently failing)

* Update comments on tests

Closes #9774 

------
Co-authored by: Susucre <34709007+susucre@users.noreply.github.com>

Mage.Sets/src/mage/sets/Warhammer40000.java

@@ -11,9 +11,7 @@ import java.util.List;
  * @author TheElk801
  */
 public final class Warhammer40000 extends ExpansionSet {
-
+	
-    private static final List<String> unfinished = Arrays.asList("Arco-Flagellant", "Sicarian Infiltrator", "Space Marine Devastator", "Ultramarines Honour Guard", "Vanguard Suppressor", "Zephyrim");
-
     private static final Warhammer40000 instance = new Warhammer40000();
 
     public static Warhammer40000 getInstance() {
@@ -300,7 +298,5 @@ public final class Warhammer40000 extends ExpansionSet {
         cards.add(new SetCardInfo("Worn Powerstone", 263, Rarity.UNCOMMON, mage.cards.w.WornPowerstone.class));
         cards.add(new SetCardInfo("Zephyrim", 20, Rarity.RARE, mage.cards.z.Zephyrim.class));
         cards.add(new SetCardInfo("Zoanthrope", 149, Rarity.RARE, mage.cards.z.Zoanthrope.class));
-
-        cards.removeIf(setCardInfo -> unfinished.contains(setCardInfo.getName())); // remove when mechanic is implemented
     }
 }

Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/SquadTest.java

@@ -0,0 +1,364 @@
+package org.mage.test.cards.abilities.keywords;
+
+import mage.constants.PhaseStep;
+import mage.constants.Zone;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.mage.test.serverside.base.CardTestPlayerBase;
+
+/**
+ * @author Susucr
+ */
+public class SquadTest extends CardTestPlayerBase {
+
+    /*
+     * Rulling at 2022-11-15
+     * 702.157. Squad
+     * 702.157a Squad is a keyword that represents two linked abilities.
+     * The first is a static ability that functions while the creature
+     * spell with squad is on the stack. The second is a triggered ability
+     * that functions when the creature with squad enters the battlefield.
+     * “Squad [cost]” means “As an additional cost to cast this spell,
+     * youmay pay [cost] any number of times” and “When this creature
+     * enters the battlefield, if its squad cost was paid, create a token
+     * that’s a copy of it for each time its squad cost was paid.” Paying
+     * a spell’s squad cost follows the rules for paying additional costs
+     * in rules 601.2b and 601.2f–h.
+     * 702.157b If a spell has multiple instances of squad, each is paid separately.
+     * If a permanent has multiple instances of squad, each triggers based
+     * on the payments made for that squad ability as it was cast, not based
+     * on payments for any other instance of squad.
+     */
+
+    /**
+     * Arco-Flagellant
+     * {2}{B} 3/1
+     * Creature — Human
+     *
+     * Squad {2} (As an additional cost to cast this spell, you may pay {2} any number of times. When this creature enters the battlefield, create that many tokens that are copies of it.)
+     * Arco-Flagellant can’t block.
+     * Endurant — Pay 3 life: Arco-Flagellant gains indestructible until end of turn.
+     */
+    private final static String flagellant = "Arco-Flagellant";
+
+    private final static String swamp = "Swamp";
+
+    @Test
+    public void test_Squad_NotUsed_Manual() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 5);
+        addCard(Zone.HAND, playerA, flagellant);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, false);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 1);
+    }
+
+    @Test
+    @Ignore
+    // TODO: enable test after squad/replicate ability will be supported by AI
+    public void test_Squad_NotUsed_AI() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 5 - 1); // haven't all mana
+        addCard(Zone.HAND, playerA, flagellant);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        //setChoice(playerA, false); - AI must choose
+
+        //setStrictChooseMode(true); - AI must choose
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 1);
+    }
+
+    @Test
+    public void test_Squad_UseOnce() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 5);
+        addCard(Zone.HAND, playerA, flagellant);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);
+        setChoice(playerA, false);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 2);
+    }
+
+    @Test
+    public void test_Squad_UseTwice() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 7);
+        addCard(Zone.HAND, playerA, flagellant);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);
+        setChoice(playerA, true);
+        setChoice(playerA, false);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.BEGIN_COMBAT);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3);
+    }
+
+    @Test
+    public void test_ZCC_ReturnedFromGraveyardMustNotRememberSquad() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 9); // 3 + 2 + 4
+        addCard(Zone.HAND, playerA, flagellant, 1);
+        // Return target creature card from your graveyard to the battlefield.
+        addCard(Zone.HAND, playerA, "Zombify", 1);
+
+        addCard(Zone.BATTLEFIELD, playerB, swamp, 1);
+        // Target creature gets -2/-2 until end of turn.
+        addCard(Zone.HAND, playerB, "Disfigure", 1);
+
+        // casting with squad
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);  // use squad once.
+        setChoice(playerA, false);
+
+        // poor flagellant dies a horrible death
+        addTarget(playerB, flagellant + "[no copy]");
+        castSpell(1, PhaseStep.BEGIN_COMBAT, playerB, "Disfigure");
+
+        // return the flagellant from graveyard
+        castSpell(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "Zombify", flagellant);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertGraveyardCount(playerB, "Disfigure", 1);
+        assertGraveyardCount(playerA, "Zombify", 1);
+        assertPermanentCount(playerA, flagellant, 2); // The first token of squad + the zombified original
+    }
+
+    @Test
+    public void test_ZCC_ReturnedToHandPermanentMustNotRememberSquad() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 8); // 3 + 2 + 3
+        addCard(Zone.HAND, playerA, flagellant, 1);
+
+        addCard(Zone.BATTLEFIELD, playerB, "Island", 2);
+        // Return target permanent to its owner's hand.
+        addCard(Zone.HAND, playerB, "Boomerang", 1);
+
+        // first cast paying for squad
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {B}", 5);
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);  // use squad once.
+        setChoice(playerA, false);
+
+        // return to hand
+        addTarget(playerB, flagellant+"[no copy]");
+        castSpell(1, PhaseStep.BEGIN_COMBAT, playerB, "Boomerang");
+
+        // second cast not paying for squad
+        castSpell(1, PhaseStep.POSTCOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, false);  // no squad
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertGraveyardCount(playerB, "Boomerang", 1);
+        assertPermanentCount(playerA, flagellant, 2); // The first token of squad + the recasted original
+    }
+
+    @Test
+    public void test_ZCC_BlinkMustNotRememberSquad() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 5); // 3 + 2
+        addCard(Zone.BATTLEFIELD, playerA, "Plains", 1);
+        addCard(Zone.HAND, playerA, flagellant, 1);
+        // Exile target creature you control, then return it to the battlefield under its owner’s control.
+        // Rebound
+        addCard(Zone.HAND, playerA, "Ephemerate", 1);
+
+        // first cast paying for squad
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {B}", 5);
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);  // use squad once.
+        setChoice(playerA, false);
+
+        // casting Ephemerate
+        addTarget(playerA, flagellant+"[no copy]");
+        castSpell(1, PhaseStep.BEGIN_COMBAT, playerA, "Ephemerate");
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 2); // The first token of squad + the blinked back original
+    }
+
+    // The squad status is a copiable value of the spell, and should be carried over on copy.
+    @Ignore
+    @Test
+    //TODO: Enable after fixing subability copying twice bug
+    public void test_CopyingSpellMustKeepSquadStatus() {
+
+        addCard(Zone.HAND, playerA, flagellant, 1);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 5); // 3 + 2
+        addCard(Zone.BATTLEFIELD, playerA, "Island", 1);
+        addCard(Zone.BATTLEFIELD, playerA, "Forest", 1);
+
+        // Copy target creature spell you control, except it isn’t legendary if the spell is legendary.
+        addCard(Zone.HAND, playerA, "Double Major", 1);
+
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {B}", 5);
+        // cast and pay once for squad, then copy it (squad status must be copied)
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true); // pay squad once
+        setChoice(playerA, false);
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Double Major", flagellant, flagellant, StackClause.WHILE_ON_STACK);
+        checkStackSize("before copy", 1, PhaseStep.PRECOMBAT_MAIN, playerA, 2); // flagellant + double major
+        waitStackResolved(1, PhaseStep.PRECOMBAT_MAIN, true);
+        checkStackSize("after copy", 1, PhaseStep.PRECOMBAT_MAIN, playerA, 2); // spell + copy
+
+        //setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 4); // One original + its squad buddy + the copy + the copy's squad buddy
+    }
+
+    // Copying the trigger remembers the squad status.
+    @Test
+    public void test_CopyingETBTriggerMustKeepSquadStatus() {
+
+        addCard(Zone.HAND, playerA, flagellant, 1);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 7); // 3 + 2 + 2
+
+        /*
+         * Strionic Resonator
+         * {2}
+         * Artifact
+         * {2}, {T}: Copy target triggered ability you control. You may choose new targets for the copy.
+         */
+        addCard(Zone.BATTLEFIELD, playerA, "Strionic Resonator", 1);
+
+        // cast and pay once for squad, then copy it (squad status must be copied)
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true); // pay squad once
+        setChoice(playerA, false);
+        waitStackResolved(1, PhaseStep.PRECOMBAT_MAIN, true);
+        // flagellant does resolve, its squad trigger goes in the stack.
+        activateAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA,
+                "{2}, {T}: Copy target triggered ability you control. You may choose new targets for the copy.");
+
+        //setStrictChooseMode(true); // Could not make it work for explicitly target the trigger with Lithoform Engine
+        setStopAt(1, PhaseStep.PRECOMBAT_MAIN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3); // One original + its squad buddy + the squad buddy from the copied trigger
+    }
+
+    @Test
+    public void test_PanharmoniconDoubleSquadETBStatus() {
+
+        addCard(Zone.HAND, playerA, flagellant, 1);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 5); // 3 + 2
+
+        // If an artifact or creature entering the battlefield causes a triggered ability
+        // of a permanent you control to trigger, that ability triggers an additional time.
+        addCard(Zone.BATTLEFIELD, playerA, "Panharmonicon", 1);
+
+        // cast and pay once for squad, then copy it (squad status must be copied)
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true); // pay squad once
+        setChoice(playerA, false);
+
+        //setStrictChooseMode(true); // There is a double trigger to put in the stack, not sure how to order them.
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3); // One original + its squad buddy + the squad buddy from the additional trigger
+    }
+
+    @Ignore
+    @Test
+    //TODO: Enable after fixing clones activating it if they have the same zcc. Also affects Kicker
+    public void test_CloneMustNotCopySquad() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 8); // 3 + 2 + 3
+        addCard(Zone.BATTLEFIELD, playerA, "Island", 1);
+        addCard(Zone.HAND, playerA, flagellant + "@flaggy", 1);
+        // You may have Clone enter the battlefield as a copy of any creature on the battlefield.
+        addCard(Zone.HAND, playerA, "Clone", 1);
+
+        activateManaAbility(1, PhaseStep.PRECOMBAT_MAIN, playerA, "{T}: Add {B}", 5);
+
+        // cast paying for squad
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);  // use squad once.
+        setChoice(playerA, false);
+
+        // cloning the flagellant
+        castSpell(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "Clone");
+        setChoice(playerA, true);  // yes to the 'may copy'
+        setChoice(playerA, "@flaggy");  // cloning the original flagellant.
+
+        //setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3); // The original + its token + the clone
+    }
+
+    @Test
+    public void test_CopyMustNotCopySquad() {
+        addCard(Zone.BATTLEFIELD, playerA, swamp, 8); // 3 + 2
+        addCard(Zone.HAND, playerA, flagellant + "@flaggy", 1);
+
+        //{T}: Create a token that’s a copy of target nonlegendary creature you control,
+        //     except it has haste. Sacrifice it at the beginning of the next end step.
+        addCard(Zone.BATTLEFIELD, playerA, "Kiki-Jiki, Mirror Breaker", 1);
+
+        // casting with a squad buddy
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, flagellant);
+        setChoice(playerA, true);  // use squad once.
+        setChoice(playerA, false);
+
+        // copying the original flagellant with kiki-jiki
+        activateAbility(1, PhaseStep.POSTCOMBAT_MAIN, playerA, "{T}: Create a token", "@flaggy");
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.POSTCOMBAT_MAIN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3); // The original + the first token of squad + the copy token
+    }
+
+    @Test
+    public void test_Squad_FreeCast() {
+        skipInitShuffling();
+
+        addCard(Zone.LIBRARY, playerA, flagellant, 1);
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 4);
+        //
+        // Whenever Etali, Primal Storm attacks, exile the top card of each player's library,
+        // then you may cast any number of nonland cards exiled this way without paying their mana costs.
+        addCard(Zone.BATTLEFIELD, playerA, "Etali, Primal Storm", 1);
+
+        checkPlayableAbility("before", 1, PhaseStep.PRECOMBAT_MAIN, playerA, "Arco-Flagellant", false);
+
+        // attack and prepare free cast, pay squad
+        attack(1, playerA, "Etali, Primal Storm", playerB);
+        setChoice(playerA, true); // cast for free
+        setChoice(playerA, true); // pay squad once.
+        setChoice(playerA, true); // pay squad twice.
+        setChoice(playerA, false);
+
+        setStrictChooseMode(true);
+        setStopAt(1, PhaseStep.END_TURN);
+        execute();
+
+        assertPermanentCount(playerA, flagellant, 3); // card + 2 buddies
+    }
+}

Mage/src/main/java/mage/abilities/keyword/SquadAbility.java

@@ -1,26 +1,45 @@
 package mage.abilities.keyword;
 
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
 import mage.abilities.StaticAbility;
-import mage.abilities.costs.Cost;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.costs.*;
 import mage.abilities.costs.mana.GenericManaCost;
+import mage.abilities.costs.mana.ManaCostsImpl;
+import mage.abilities.effects.CreateTokenCopySourceEffect;
+import mage.abilities.effects.Effect;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
 import mage.constants.Zone;
+import mage.game.Game;
+import mage.players.Player;
+import mage.util.CardUtil;
 
 /**
- * @author TheElk801
+ * @author notgreat
  */
-public class SquadAbility extends StaticAbility {
 
+public class SquadAbility extends StaticAbility implements OptionalAdditionalSourceCosts {
+    protected OptionalAdditionalCost cost;
+    protected static final String SQUAD_KEYWORD = "Squad";
+    protected static final String SQUAD_REMINDER = "You may pay an additional "
+            + "{cost} any number of times as you cast this spell.";
     public SquadAbility() {
         this(new GenericManaCost(2));
     }
 
     public SquadAbility(Cost cost) {
         super(Zone.STACK, null);
-        // TODO: implement this
+        setSquadCost(cost);
+        addSubAbility(new SquadTriggerAbility());
+        //Note that I get subabilities list's position 0 to modify the zcc/count references
     }
 
     private SquadAbility(final SquadAbility ability) {
         super(ability);
+        this.cost = ability.cost.copy();
     }
 
     @Override
@@ -28,8 +47,154 @@ public class SquadAbility extends StaticAbility {
         return new SquadAbility(this);
     }
 
+    public final void setSquadCost(Cost cost) {
+        OptionalAdditionalCost newCost = new OptionalAdditionalCostImpl(
+                SQUAD_KEYWORD, SQUAD_REMINDER, cost);
+        newCost.setRepeatable(true);
+        newCost.setCostType(VariableCostType.ADDITIONAL);
+        this.cost = newCost;
+    }
+
+    private void reset() {
+        cost.reset();
+    }
+
+    protected static int get_zcc(Ability source, Game game) {
+        // Squad/Kicker activates in STACK zone so all zcc must be from "stack moment"
+        // Use cases:
+        // * resolving spell have same zcc (example: check kicker status in sorcery/instant);
+        // * copied spell have same zcc as source spell (see Spell.copySpell and zcc sync);
+        // * creature/token from resolved spell have +1 zcc after moved to battlefield (example: check kicker status in ETB triggers/effects);
+
+        // find object info from the source ability (it can be a permanent or a spell on stack, on the moment of trigger/resolve)
+        MageObject sourceObject = source.getSourceObject(game);
+        Zone sourceObjectZone = game.getState().getZone(sourceObject.getId());
+        int zcc = CardUtil.getActualSourceObjectZoneChangeCounter(game, source);
+
+        // find "stack moment" zcc:
+        // * permanent cards enters from STACK to BATTLEFIELD (+1 zcc)
+        // * permanent tokens enters from OUTSIDE to BATTLEFIELD (+1 zcc, see prepare code in TokenImpl.putOntoBattlefieldHelper)
+        // * spells and copied spells resolves on STACK (zcc not changes)
+        if (sourceObjectZone != Zone.STACK) {
+            --zcc;
+        }
+        return zcc;
+    }
+
+    @Override
+    public void addOptionalAdditionalCosts(Ability ability, Game game) {
+        if (!(ability instanceof SpellAbility)) {
+            return;
+        }
+        Player player = game.getPlayer(ability.getControllerId());
+        if (player == null) {
+            return;
+        }
+        this.reset();
+        boolean again = true;
+        while (player.canRespond() && again) {
+            String times = "";
+            int activatedCount = getSquadCount();
+            times = (activatedCount + 1) + (activatedCount == 0 ? " time " : " times ");
+            // TODO: add AI support to find max number of possible activations (from available mana)
+            //  canPay checks only single mana available, not total mana usage
+            if (cost.canPay(ability, this, ability.getControllerId(), game)
+                    && player.chooseUse(/*Outcome.Benefit*/Outcome.AIDontUseIt,
+                    "Pay " + times + cost.getText(false) + " ?", ability, game)) {
+                cost.activate();
+                if (cost instanceof ManaCostsImpl) {
+                    ability.getManaCostsToPay().add((ManaCostsImpl) cost.copy());
+                } else {
+                    ability.getCosts().add(cost.copy());
+                }
+            } else {
+                again = false;
+            }
+        }
+        SquadTriggerAbility squadETB = (SquadTriggerAbility)getSubAbilities().get(0);
+        squadETB.zcc = get_zcc(ability, game);
+        SquadEffectETB squadEffect = (SquadEffectETB)squadETB.getEffects().get(0);
+        squadEffect.activationCount = cost.getActivateCount();
+    }
+
+    @Override
+    public String getCastMessageSuffix() {
+        if (cost.isActivated()) {
+            return cost.getCastSuffixMessage(0);
+        }
+        return "";
+    }
+
     @Override
     public String getRule() {
-        return "Squad";
+        return "Squad "+cost.getText()+" <i>(As an additional cost to cast this spell, you may pay "+
+            cost.getText()+"any number of times. When this creature enters the battlefield, "+
+            "create that many tokens that are copies of it.)</i>";
+    }
+
+    /**
+     * Number of times squad cost was paid
+     *
+     * @return int activation count
+     */
+    public int getSquadCount() {
+        return cost.getActivateCount();
+    }
+}
+class SquadTriggerAbility extends EntersBattlefieldTriggeredAbility {
+    protected Integer zcc;
+    public SquadTriggerAbility() {
+        super(new SquadEffectETB());
+        this.setRuleVisible(false);
+    }
+
+    private SquadTriggerAbility(final SquadTriggerAbility ability) {
+        super(ability);
+        this.zcc = ability.zcc;
+    }
+    @Override
+    public SquadTriggerAbility copy() {
+        return new SquadTriggerAbility(this);
+    }
+
+    @Override
+    public boolean checkInterveningIfClause(Game game) {
+        if (zcc != null && zcc == SquadAbility.get_zcc(this, game)){
+            SquadEffectETB effect = (SquadEffectETB)getEffects().get(0);
+            return effect.activationCount > 0;
+        }
+        return false;
+    }
+    @Override
+    public String getRule() {
+        return "Squad <i>(When this creature enters the battlefield, if its squad cost was paid, "
+                + "create a token that’s a copy of it for each time its squad cost was paid.)</i>";
+    }
+}
+
+class SquadEffectETB extends OneShotEffect {
+    protected Integer activationCount;
+
+    SquadEffectETB() {
+        super(Outcome.Benefit);
+    }
+
+    private SquadEffectETB(final SquadEffectETB effect) {
+        super(effect);
+        this.activationCount = effect.activationCount;
+    }
+
+    @Override
+    public SquadEffectETB copy() {
+        return new SquadEffectETB(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        if (activationCount != null) {
+            CreateTokenCopySourceEffect effect = new CreateTokenCopySourceEffect(activationCount);
+            return effect.apply(game, source);
+        }
+        return true;
     }
 }