Implemented The Cauldron of Eternity

Mage.Sets/src/mage/cards/t/TheCauldronOfEternity.java

@@ -0,0 +1,104 @@
+package mage.cards.t;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.SpellAbility;
+import mage.abilities.common.ActivateAsSorceryActivatedAbility;
+import mage.abilities.common.DiesCreatureTriggeredAbility;
+import mage.abilities.common.SimpleStaticAbility;
+import mage.abilities.costs.common.PayLifeCost;
+import mage.abilities.costs.common.TapSourceCost;
+import mage.abilities.costs.mana.ManaCostsImpl;
+import mage.abilities.effects.common.PutOnLibraryTargetEffect;
+import mage.abilities.effects.common.ReturnFromGraveyardToBattlefieldTargetEffect;
+import mage.abilities.effects.common.cost.CostModificationEffectImpl;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.*;
+import mage.filter.StaticFilters;
+import mage.game.Game;
+import mage.players.Player;
+import mage.target.common.TargetCardInYourGraveyard;
+import mage.util.CardUtil;
+
+import java.util.UUID;
+
+/**
+ * @author TheElk801
+ */
+public final class TheCauldronOfEternity extends CardImpl {
+
+    public TheCauldronOfEternity(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.ARTIFACT}, "{10}{B}{B}");
+
+        this.addSuperType(SuperType.LEGENDARY);
+
+        // This spell costs {2} less for each creature card in your graveyard.
+        this.addAbility(new SimpleStaticAbility(Zone.ALL, new TheCauldronOfEternityCostReductionEffect()));
+
+        // Whenever a creature you control dies, put it on the bottom of its owner's library.
+        this.addAbility(new DiesCreatureTriggeredAbility(
+                new PutOnLibraryTargetEffect(false, "put it on the bottom of its owner's library"),
+                false, StaticFilters.FILTER_CONTROLLED_A_CREATURE, true
+        ));
+
+        // {2}{B}, {T}, Pay 2 life: Return target creature card from your graveyard to the battlefield. Activate this ability only any time you could cast a sorcery.
+        Ability ability = new ActivateAsSorceryActivatedAbility(
+                Zone.BATTLEFIELD, new ReturnFromGraveyardToBattlefieldTargetEffect(), new ManaCostsImpl("{2}{B}")
+        );
+        ability.addCost(new TapSourceCost());
+        ability.addCost(new PayLifeCost(2));
+        ability.addTarget(new TargetCardInYourGraveyard(StaticFilters.FILTER_CARD_CREATURE_YOUR_GRAVEYARD));
+        this.addAbility(ability);
+    }
+
+    private TheCauldronOfEternity(final TheCauldronOfEternity card) {
+        super(card);
+    }
+
+    @Override
+    public TheCauldronOfEternity copy() {
+        return new TheCauldronOfEternity(this);
+    }
+}
+
+class TheCauldronOfEternityCostReductionEffect extends CostModificationEffectImpl {
+
+    TheCauldronOfEternityCostReductionEffect() {
+        super(Duration.WhileOnStack, Outcome.Benefit, CostModificationType.REDUCE_COST);
+        staticText = "This spell costs {2} less for each creature card in your graveyard";
+    }
+
+    private TheCauldronOfEternityCostReductionEffect(final TheCauldronOfEternityCostReductionEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source, Ability abilityToModify) {
+        Player player = game.getPlayer(source.getControllerId());
+        if (player == null) {
+            return false;
+        }
+        int reductionAmount = player
+                .getGraveyard()
+                .getCards(game)
+                .stream()
+                .filter(MageObject::isCreature)
+                .mapToInt(card -> 2)
+                .sum();
+        CardUtil.reduceCost(abilityToModify, reductionAmount);
+        return true;
+    }
+
+    @Override
+    public boolean applies(Ability abilityToModify, Ability source, Game game) {
+        return abilityToModify instanceof SpellAbility
+                && abilityToModify.getSourceId().equals(source.getSourceId())
+                && game.getCard(abilityToModify.getSourceId()) != null;
+    }
+
+    @Override
+    public TheCauldronOfEternityCostReductionEffect copy() {
+        return new TheCauldronOfEternityCostReductionEffect(this);
+    }
+}

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

@@ -236,6 +236,7 @@ public final class ThroneOfEldraine extends ExpansionSet {
         cards.add(new SetCardInfo("Tall as a Beanstalk", 178, Rarity.COMMON, mage.cards.t.TallAsABeanstalk.class));
         cards.add(new SetCardInfo("Taste of Death", 320, Rarity.RARE, mage.cards.t.TasteOfDeath.class));
         cards.add(new SetCardInfo("Tempting Witch", 108, Rarity.COMMON, mage.cards.t.TemptingWitch.class));
+        cards.add(new SetCardInfo("The Cauldron of Eternity", 82, Rarity.MYTHIC, mage.cards.t.TheCauldronOfEternity.class));
         cards.add(new SetCardInfo("The Circle of Loyalty", 9, Rarity.MYTHIC, mage.cards.t.TheCircleOfLoyalty.class));
         cards.add(new SetCardInfo("The Great Henge", 161, Rarity.MYTHIC, mage.cards.t.TheGreatHenge.class));
         cards.add(new SetCardInfo("The Magic Mirror", 51, Rarity.MYTHIC, mage.cards.t.TheMagicMirror.class));