Implemented Centaur Mediator

Mage.Sets/src/mage/cards/c/CentaurMediator.java

@@ -0,0 +1,70 @@
+package mage.cards.c;
+
+import java.util.UUID;
+import mage.abilities.Ability;
+import mage.abilities.common.EntersBattlefieldTriggeredAbility;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.SubType;
+import mage.cards.CardImpl;
+import mage.cards.CardSetInfo;
+import mage.constants.CardType;
+import mage.constants.Outcome;
+import mage.game.Game;
+
+/**
+ *
+ * @author TheElk801
+ */
+public final class CentaurMediator extends CardImpl {
+
+    public CentaurMediator(UUID ownerId, CardSetInfo setInfo) {
+        super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{G}{W}");
+
+        this.subtype.add(SubType.CENTAUR);
+        this.subtype.add(SubType.CLERIC);
+
+        // When Centaur Mediator enters the battlefield, each player gains 4 life.
+        this.addAbility(new EntersBattlefieldTriggeredAbility(
+                new CentaurMediatorEffect()
+        ));
+    }
+
+    public CentaurMediator(final CentaurMediator card) {
+        super(card);
+    }
+
+    @Override
+    public CentaurMediator copy() {
+        return new CentaurMediator(this);
+    }
+}
+
+class CentaurMediatorEffect extends OneShotEffect {
+
+    public CentaurMediatorEffect() {
+        super(Outcome.GainLife);
+        staticText = "each player gains 4 life.";
+    }
+
+    public CentaurMediatorEffect(final CentaurMediatorEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public CentaurMediatorEffect copy() {
+        return new CentaurMediatorEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        game.getState().getPlayersInRange(
+                source.getControllerId(), game
+        ).stream().map((playerId) -> game.getPlayer(playerId)).filter(
+                (player) -> (player != null)
+        ).forEachOrdered((player) -> {
+            player.gainLife(4, game, source);
+        });
+        return true;
+    }
+
+}

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

@@ -38,6 +38,7 @@ public final class GuildsOfRavnica extends ExpansionSet {
         cards.add(new SetCardInfo("Boros Guildgate", 244, Rarity.COMMON, mage.cards.b.BorosGuildgate.class));
         cards.add(new SetCardInfo("Boros Locket", 231, Rarity.COMMON, mage.cards.b.BorosLocket.class));
         cards.add(new SetCardInfo("Bounty Agent", 2, Rarity.RARE, mage.cards.b.BountyAgent.class));
+        cards.add(new SetCardInfo("Centaur Mediator", 158, Rarity.COMMON, mage.cards.c.CentaurMediator.class));
         cards.add(new SetCardInfo("Chemister's Insight", 32, Rarity.UNCOMMON, mage.cards.c.ChemistersInsight.class));
         cards.add(new SetCardInfo("Chromatic Lantern", 233, Rarity.RARE, mage.cards.c.ChromaticLantern.class));
         cards.add(new SetCardInfo("Citywatch Sphinx", 33, Rarity.UNCOMMON, mage.cards.c.CitywatchSphinx.class));