[LTC] Implement Bilbo, Birthday Celebrant

Mage/src/main/java/mage/abilities/effects/common/replacement/GainPlusOneLifeReplacementEffect.java

@@ -0,0 +1,50 @@
+package mage.abilities.effects.common.replacement;
+
+import mage.abilities.Ability;
+import mage.abilities.effects.ReplacementEffectImpl;
+import mage.constants.Duration;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.events.GameEvent;
+import mage.util.CardUtil;
+
+/**
+ * @author TheElk801
+ */
+public class GainPlusOneLifeReplacementEffect extends ReplacementEffectImpl {
+
+    public GainPlusOneLifeReplacementEffect() {
+        super(Duration.WhileOnBattlefield, Outcome.Benefit);
+        staticText = "if you would gain life, you gain that much life plus 1 instead";
+    }
+
+    private GainPlusOneLifeReplacementEffect(final GainPlusOneLifeReplacementEffect effect) {
+        super(effect);
+    }
+
+    @Override
+    public GainPlusOneLifeReplacementEffect copy() {
+        return new GainPlusOneLifeReplacementEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return true;
+    }
+
+    @Override
+    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
+        event.setAmount(CardUtil.overflowInc(event.getAmount(), 1));
+        return false;
+    }
+
+    @Override
+    public boolean checksEventType(GameEvent event, Game game) {
+        return event.getType() == GameEvent.EventType.GAIN_LIFE;
+    }
+
+    @Override
+    public boolean applies(GameEvent event, Ability source, Game game) {
+        return source.isControlledBy(event.getPlayerId());
+    }
+}