[TDM] Implement Severance Priest

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

@@ -0,0 +1,74 @@
+package mage.abilities.effects.common;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
+import mage.game.ExileZone;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.game.permanent.token.Token;
+import mage.util.CardUtil;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Function;
+
+/**
+ * @author TheElk801
+ */
+public class CreateXXTokenExiledEffectManaValueEffect extends OneShotEffect {
+
+    private final Function<Integer, Token> tokenMaker;
+
+    public CreateXXTokenExiledEffectManaValueEffect(Function<Integer, Token> tokenMaker, String description) {
+        super(Outcome.Benefit);
+        this.tokenMaker = tokenMaker;
+        staticText = "the exiled card's owner creates an X/X " + description +
+                "creature token, where X is the mana value of the exiled card";
+    }
+
+    private CreateXXTokenExiledEffectManaValueEffect(final CreateXXTokenExiledEffectManaValueEffect effect) {
+        super(effect);
+        this.tokenMaker = effect.tokenMaker;
+    }
+
+    @Override
+    public CreateXXTokenExiledEffectManaValueEffect copy() {
+        return new CreateXXTokenExiledEffectManaValueEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent permanentLeftBattlefield = (Permanent) getValue("permanentLeftBattlefield");
+        ExileZone exile = game.getExile().getExileZone(
+                CardUtil.getExileZoneId(game, source.getSourceId(), permanentLeftBattlefield.getZoneChangeCounter(game))
+        );
+        if (exile == null || exile.isEmpty()) {
+            return false;
+        }
+        // From ZNR Release Notes:
+        // https://magic.wizards.com/en/articles/archive/feature/zendikar-rising-release-notes-2020-09-10
+        // If Skyclave Apparition's first ability exiled more than one card owned by a single player,
+        // that player creates a token with power and toughness equal to the sum of those cards' converted mana costs.
+        // If the first ability exiled cards owned by more than one player, each of those players creates a token
+        // with power and toughness equal to the sum of the converted mana costs of all cards exiled by the first ability.
+        Set<UUID> owners = new HashSet<>();
+        int totalCMC = exile
+                .getCards(game)
+                .stream()
+                .filter(Objects::nonNull)
+                .map(card -> {
+                    owners.add(card.getOwnerId());
+                    return card;
+                })
+                .mapToInt(MageObject::getManaValue)
+                .sum();
+        for (UUID playerId : owners) {
+            tokenMaker.apply(totalCMC).putOntoBattlefield(1, game, source, playerId);
+        }
+        return true;
+    }
+}