replace groovy code with ability

release/Magarena/scripts/Fists_of_Ironwood.groovy

@@ -1,20 +0,0 @@
-[
-    new MagicWhenComesIntoPlayTrigger() {
-        @Override
-        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent, final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                permanent,
-                this,
-                "PN puts two 1/1 green Saproling creature tokens onto the battlefield."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            game.doAction(new MagicPlayTokensAction(
-                event.getPlayer(),
-                TokenCardDefinitions.get("1/1 green Saproling creature token"),
-                2
-            ));
-        }
-    }
-]

release/Magarena/scripts/Fists_of_Ironwood.txt

@@ -6,7 +6,7 @@ rarity=C
 type=Enchantment
 subtype=Aura
 cost={1}{G}
+ability=enters effect PN puts two 1/1 green Saproling creature tokens onto the battlefield.
 given_ability=trample
 timing=aura
 enchant=trample,pos creature
-requires_groovy_code