replace groovy code with card script

release/Magarena/scripts/Dross_Hopper.groovy

@@ -1,28 +0,0 @@
-[
-    new MagicPermanentActivation(
-        new MagicActivationHints(MagicTiming.Pump),
-        "Flying"
-    ) {
-        @Override
-        public Iterable<MagicEvent> getCostEvent(final MagicPermanent source) {
-            return [
-                new MagicSacrificePermanentEvent(
-                    source,
-                    MagicTargetChoice.SACRIFICE_CREATURE
-                )
-            ];
-        }
-        @Override
-        public MagicEvent getPermanentEvent(final MagicPermanent source,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                source,
-                this,
-                "SN gains flying until end of turn."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            game.doAction(new MagicGainAbilityAction(event.getPermanent(),MagicAbility.Flying));
-        }
-    }
-]

release/Magarena/scripts/Dross_Hopper.txt

@@ -7,5 +7,5 @@ type=Creature
 subtype=Insect,Horror
 cost={1}{B}
 pt=2/1
+ability=pay Sacrifice a creature: SN gains flying until end of turn.
 timing=main
-requires_groovy_code