Implemented Oko, the Trickster

Mage.Sets/src/mage/cards/o/OkoTheTrickster.java

@@ -0,0 +1,97 @@
+package mage.cards.o;
+
+import mage.abilities.Ability;
+import mage.abilities.LoyaltyAbility;
+import mage.abilities.common.PlaneswalkerEntersWithLoyaltyCountersAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.abilities.effects.common.PreventAllDamageToSourceEffect;
+import mage.abilities.effects.common.continuous.GainAbilityAllEffect;
+import mage.abilities.effects.common.continuous.SetPowerToughnessAllEffect;
+import mage.abilities.effects.common.counter.AddCountersTargetEffect;
+import mage.abilities.keyword.TrampleAbility;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.counters.CounterType;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.target.common.TargetControlledCreaturePermanent;
+import mage.util.functions.EmptyApplyToPermanent;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class OkoTheTrickster extends CardImpl {
+
+    public OkoTheTrickster(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.PLANESWALKER}, "{4}{G}{U}");
+
+        this.addSuperType(SuperType.LEGENDARY);
+        this.subtype.add(SubType.OKO);
+        this.addAbility(new PlaneswalkerEntersWithLoyaltyCountersAbility(4));
+
+        // +1: Put two +1/+1 counters on up to one target creature you control.
+        Ability ability = new LoyaltyAbility(
+                new AddCountersTargetEffect(CounterType.P1P1.createInstance(2)), 1
+        );
+        ability.addTarget(new TargetControlledCreaturePermanent(0, 1));
+        this.addAbility(ability);
+
+        // 0: Until end of turn, Oko, the Trickster becomes a copy of target creature you control. Prevent all damage that would be dealt to him this turn.
+        ability = new LoyaltyAbility(new OkoTheTricksterCopyEffect(), 0);
+        ability.addEffect(new PreventAllDamageToSourceEffect(Duration.EndOfTurn)
+                .setText("Prevent all damage that would be dealt to him this turn."));
+        ability.addTarget(new TargetControlledCreaturePermanent());
+        this.addAbility(ability);
+
+        // −7: Until end of turn, each creature you control has base power and toughness 10/10 and gains trample.
+        ability = new LoyaltyAbility(new SetPowerToughnessAllEffect(
+                10, 10, Duration.EndOfTurn, StaticFilters.FILTER_CONTROLLED_CREATURE, true
+        ).setText("Until end of turn, each creature you control has base power and toughness 10/10"), -7);
+        ability.addEffect(new GainAbilityAllEffect(
+                TrampleAbility.getInstance(), Duration.EndOfTurn,
+                StaticFilters.FILTER_CONTROLLED_CREATURE
+        ).setText("and gains trample"));
+        this.addAbility(ability);
+    }
+
+    private OkoTheTrickster(final OkoTheTrickster card) {
+        super(card);
+    }
+
+    @Override
+    public OkoTheTrickster copy() {
+        return new OkoTheTrickster(this);
+    }
+}
+
+class OkoTheTricksterCopyEffect extends OneShotEffect {
+
+    OkoTheTricksterCopyEffect() {
+        super(Outcome.Copy);
+        this.staticText = "Until end of turn, {this} becomes a copy of target creature you control.";
+    }
+
+    private OkoTheTricksterCopyEffect(final OkoTheTricksterCopyEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public OkoTheTricksterCopyEffect copy() {
+        return new OkoTheTricksterCopyEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent sourcePermanent = game.getPermanent(source.getSourceId());
+        Permanent copyFromPermanent = game.getPermanent(getTargetPointer().getFirst(game, source));
+        if (sourcePermanent == null || copyFromPermanent == null) {
+            return false;
+        }
+        game.copyPermanent(Duration.EndOfTurn, copyFromPermanent, sourcePermanent.getId(), source, new EmptyApplyToPermanent());
+        return true;
+    }
+}

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

@@ -82,6 +82,7 @@ public final class ThroneOfEldraine extends ExpansionSet {
         cards.add(new SetCardInfo("Oko's Accomplices", 310, Rarity.COMMON, mage.cards.o.OkosAccomplices.class));
         cards.add(new SetCardInfo("Oko's Hospitality", 312, Rarity.RARE, mage.cards.o.OkosHospitality.class));
         cards.add(new SetCardInfo("Oko, Thief of Crowns", 197, Rarity.MYTHIC, mage.cards.o.OkoThiefOfCrowns.class));
+        cards.add(new SetCardInfo("Oko, the Trickster", 309, Rarity.MYTHIC, mage.cards.o.OkoTheTrickster.class));
         cards.add(new SetCardInfo("Once Upon a Time", 169, Rarity.RARE, mage.cards.o.OnceUponATime.class));
         cards.add(new SetCardInfo("Order of Midnight", 99, Rarity.UNCOMMON, mage.cards.o.OrderOfMidnight.class));
         cards.add(new SetCardInfo("Piper of the Swarm", 100, Rarity.RARE, mage.cards.p.PiperOfTheSwarm.class));