replace groovy code with ability

release/Magarena/scripts/Dragon5.txt

@@ -1,4 +1,4 @@
-name=Dragon5
+name=5/5 red Dragon creature token with flying
 token=Dragon
 image=http://magiccards.info/extras/token/worldwake/dragon.jpg
 value=5

release/Magarena/scripts/Dragon_Roost.groovy

@@ -1,26 +0,0 @@
-[
-    new MagicPermanentActivation(
-        new MagicActivationHints(MagicTiming.Token),
-        "Token"
-    ) {
-
-        @Override
-        public Iterable<MagicEvent> getCostEvent(final MagicPermanent source) {
-            return [new MagicPayManaCostEvent(source,"{5}{R}{R}")];
-        }
-
-        @Override
-        public MagicEvent getPermanentEvent(final MagicPermanent source,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                source,
-                this,
-                "Put a 5/5 red Dragon creature token with flying onto the battlefield."
-            );
-        }
-
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            game.doAction(new MagicPlayTokenAction(event.getPlayer(),TokenCardDefinitions.get("Dragon5")));
-        }
-    }
-]

release/Magarena/scripts/Dragon_Roost.txt

@@ -5,5 +5,5 @@ value=3.924
 rarity=R
 type=Enchantment
 cost={4}{R}{R}
+ability=pay {5}{R}{R}: PN puts a 5/5 red Dragon creature token with flying onto the battlefield.
 timing=enchantment
-requires_groovy_code