Fixed GoadAllEffect from affecting creatures that ETB after it resolves. Closes #9227.

Mage.Sets/src/mage/cards/m/MockingDoppelganger.java

@@ -44,7 +44,7 @@ public final class MockingDoppelganger extends CardImpl {
         @Override
         public boolean apply(Game game, MageObject blueprint, Ability source, UUID copyToObjectId) {
             blueprint.getAbilities().add(new SimpleStaticAbility(new GoadAllEffect(
-                    Duration.WhileOnBattlefield, filter
+                    Duration.WhileOnBattlefield, filter, false
             ).setText("other creatures with the same name as this creature are goaded")));
             return true;
         }

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

@@ -10,6 +10,7 @@ import mage.game.GameException;
 import mage.game.mulligan.MulliganType;
 import mage.game.permanent.Permanent;
 import mage.players.Player;
+import mage.util.functions.Function;
 import org.junit.Assert;
 import org.junit.Test;
 import org.mage.test.player.TestPlayer;
@@ -62,6 +63,34 @@ public class GoadTest extends CardTestMultiPlayerBase {
         );
     }
 
+    /**
+     * Checks whether the given attacker is NOT goaded by the provided player(s).
+     *
+     * @param attacker  the name of the attacker
+     * @param players   the player(s) that the attacker is supposed to be goaded by.
+     */
+    private void assertNotGoaded(String attacker, TestPlayer... players) {
+        Assert.assertTrue("At least one player should be provided", players.length > 0);
+        Permanent permanent = getPermanent(attacker);
+        Assert.assertNotEquals(
+                "Creature should be goaded by "
+                        + Arrays
+                        .stream(players)
+                        .map(Player::getName)
+                        .reduce((a, b) -> a + ", " + b).orElse(""),
+                permanent.getGoadingPlayers(),
+                Arrays.stream(players)
+                        .map(TestPlayer::getId)
+                        .collect(Collectors.toSet())
+        );
+    }
+
+    /**
+     * Checks whether the given attacker is goaded by the provided player(s).
+     *
+     * @param attacker  the name of the attacker
+     * @param players   the player(s) that the attacker is supposed to be goaded by.
+     */
     private void assertGoaded(String attacker, TestPlayer... players) {
         Assert.assertTrue("At least one player should be provided", players.length > 0);
         Permanent permanent = getPermanent(attacker);
@@ -194,4 +223,40 @@ public class GoadTest extends CardTestMultiPlayerBase {
 
         assertAttacking("Berserkers of Blood Ridge", playerB, playerC, playerD);
     }
+
+    /**
+     * Reported bug: https://github.com/magefree/mage/issues/9227
+     * Geode Rager (and other goad all effects) goad creatures that enter the battlefield after the effect resolved.
+     *
+     * Ruling:
+     *      Creatures that enter the battlefield or come under the target player’s control after Geode Rager’s ability has resolved won’t be goaded.
+     *      (2020-09-25)
+     */
+    @Test
+    public void goadAllCorrectAffect() {
+        addCard(Zone.BATTLEFIELD, playerA, "Geode Rager");
+        addCard(Zone.HAND, playerA, "Swamp");
+
+        addCard(Zone.BATTLEFIELD, playerD, "Goblin Balloon Brigade");
+        addCard(Zone.BATTLEFIELD, playerD, "Mountain");
+        addCard(Zone.HAND, playerD, "Goblin Champion");
+
+        setStrictChooseMode(true);
+
+        playLand(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Swamp");
+        addTarget(playerA, playerD); // Goad all of playerD's creatures
+
+        castSpell(2, PhaseStep.PRECOMBAT_MAIN, playerD, "Goblin Champion");
+        addTarget(playerD, playerC); // Goblin Balloon Brigade attack player C
+        // Should not have to specify a target for Goblin Champion since they aren't goaded
+
+        setStopAt(2, PhaseStep.DECLARE_BLOCKERS);
+
+        execute();
+        assertAllCommandsUsed();
+
+        assertGoaded("Goblin Balloon Brigade", playerA);
+        assertNotGoaded("Goblin Champion", playerA);
+    }
+
 }

Mage/src/main/java/mage/abilities/effects/common/combat/GoadAllEffect.java

@@ -24,8 +24,13 @@ public class GoadAllEffect extends ContinuousEffectImpl {
     }
 
     public GoadAllEffect(Duration duration, FilterPermanent filter) {
+        this(duration, filter, true);
+    }
+
+    public GoadAllEffect(Duration duration, FilterPermanent filter, boolean affectedObjectsSet) {
         super(duration, Layer.RulesEffects, SubLayer.NA, Outcome.Detriment);
         this.filter = filter;
+        this.affectedObjectsSet = affectedObjectsSet;
     }
 
     private GoadAllEffect(final GoadAllEffect effect) {