replace groovy script with ability property

release/Magarena/scripts/Angel_s_Mercy.groovy

@@ -1,16 +0,0 @@
-[
-    new MagicSpellCardEvent() {
-        @Override
-        public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                cardOnStack,
-                this,
-                "PN gains 7 life."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            game.doAction(new MagicChangeLifeAction(event.getPlayer(),7));
-        }
-    }
-]

release/Magarena/scripts/Angel_s_Mercy.txt

@@ -5,5 +5,5 @@ value=1.353
 rarity=C
 type=Instant
 cost={2}{W}{W}
+effect=PN gains 7 life.
 timing=draw
-requires_groovy_code