Add finality counters (#11379)

* [LCI] Implement Soulcoil Viper

* add finality counter test

* fix bug, add extra test

* [LCI] Implement Uchbenbak, the Great Mistake

Mage/src/main/java/mage/abilities/effects/keyword/FinalityCounterEffect.java

@@ -0,0 +1,57 @@
+package mage.abilities.effects.keyword;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.ReplacementEffectImpl;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.constants.Zone;
+import mage.counters.CounterType;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.game.events.ZoneChangeEvent;
+import mage.game.permanent.Permanent;
+
+/**
+ * @author TheElk801
+ */
+public class FinalityCounterEffect extends ReplacementEffectImpl {
+
+    public FinalityCounterEffect() {
+        super(Duration.Custom, Outcome.Tap);
+        this.staticText = "If a creature with a finality counter on it would die, exile it instead.";
+    }
+
+    private FinalityCounterEffect(final FinalityCounterEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public FinalityCounterEffect copy() {
+        return new FinalityCounterEffect(this);
+    }
+
+    @Override
+    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
+        ((ZoneChangeEvent) event).setToZone(Zone.EXILED);
+        return false;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.ZONE_CHANGE;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        if (!((ZoneChangeEvent) event).isDiesEvent()) {
+            return false;
+        }
+        Permanent permanent = game.getPermanent(event.getTargetId());
+        return permanent != null && permanent.getCounters(game).getCount(CounterType.FINALITY) > 0;
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return true;
+    }
+}