replace groovy code with ability in card script

release/Magarena/scripts/Grasp_of_Darkness.groovy

@@ -1,22 +0,0 @@
-[
-    new MagicSpellCardEvent() {
-        @Override
-        public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                cardOnStack,
-                MagicTargetChoice.NEG_TARGET_CREATURE,
-                new MagicWeakenTargetPicker(4,4),
-                this,
-                "Target creature\$ gets -4/-4 until end of turn."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            event.processTargetPermanent(game,new MagicPermanentAction() {
-                public void doAction(final MagicPermanent creature) {
-                    game.doAction(new MagicChangeTurnPTAction(creature,-4,-4));
-                }
-            });
-        }
-    }
-]

release/Magarena/scripts/Grasp_of_Darkness.txt

@@ -6,5 +6,5 @@ removal=3
 rarity=C
 type=Instant
 cost={B}{B}
+effect=Target creature gets -4/-4 until end of turn.
 timing=removal
-requires_groovy_code