[FIC] Implement Amarant Coral

Mage/src/main/java/mage/abilities/effects/common/DamageEachOtherOpponentThatMuchEffect.java

@@ -0,0 +1,47 @@
+package mage.abilities.effects.common;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
+import mage.game.Game;
+
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public class DamageEachOtherOpponentThatMuchEffect extends OneShotEffect {
+
+    public DamageEachOtherOpponentThatMuchEffect() {
+        super(Outcome.Benefit);
+        staticText = "it deals that much damage to each other opponent";
+    }
+
+    private DamageEachOtherOpponentThatMuchEffect(final DamageEachOtherOpponentThatMuchEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public DamageEachOtherOpponentThatMuchEffect copy() {
+        return new DamageEachOtherOpponentThatMuchEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        int damage = (Integer) getValue("damage");
+        if (damage < 1) {
+            return false;
+        }
+        UUID playerId = getTargetPointer().getFirst(game, source);
+        for (UUID opponentId : game.getOpponents(source.getControllerId())) {
+            if (opponentId.equals(playerId)) {
+                continue;
+            }
+            Optional.ofNullable(opponentId)
+                    .map(game::getPlayer)
+                    .ifPresent(player -> player.damage(damage, source, game));
+        }
+        return true;
+    }
+}