replace groovy code with ability in card script

release/Magarena/scripts/Turn_the_Tide.groovy

@@ -1,21 +0,0 @@
-[
-    new MagicSpellCardEvent() {
-        @Override
-        public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                cardOnStack,
-                this,
-                "Creatures your opponent controls get -2/-0 until end of turn."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            final MagicPlayer opponent=event.getPlayer().getOpponent();
-            final Collection<MagicPermanent> targets=
-                game.filterPermanents(opponent,MagicTargetFilter.TARGET_CREATURE_YOU_CONTROL);
-            for (final MagicPermanent target : targets) {
-                game.doAction(new MagicChangeTurnPTAction(target,-2,0));
-            }
-        }
-    }
-]

release/Magarena/scripts/Turn_the_Tide.txt

@@ -5,5 +5,5 @@ value=2.569
 rarity=C
 type=Instant
 cost={1}{U}
+effect=Creatures your opponents control get -2/-0 until end of turn.
 timing=removal
-requires_groovy_code