[SNC] Implemented Graveyard Shift

Mage/src/main/java/mage/abilities/condition/common/DifferentManaValuesInGraveCondition.java

@@ -0,0 +1,38 @@
+package mage.abilities.condition.common;
+
+import mage.MageObject;
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+import mage.players.Player;
+import mage.util.CardUtil;
+
+/**
+ * @author TheElk801
+ */
+public enum DifferentManaValuesInGraveCondition implements Condition {
+    FIVE(5);
+    private final int amount;
+
+    DifferentManaValuesInGraveCondition(int amount) {
+        this.amount = amount;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Player player = game.getPlayer(source.getControllerId());
+        return player != null
+                && player
+                .getGraveyard()
+                .getCards(game)
+                .stream()
+                .mapToInt(MageObject::getManaValue)
+                .distinct()
+                .count() >= amount;
+    }
+
+    @Override
+    public String toString() {
+        return "there are " + CardUtil.numberToText(amount) + " or more mana values among cards in your graveyard";
+    }
+}