replace groovy code with effect in card script

release/Magarena/scripts/Careful_Study.groovy

@@ -1,17 +0,0 @@
-[
-    new MagicSpellCardEvent() {
-        @Override
-        public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
-            return new MagicEvent(
-                cardOnStack,
-                this,
-                "PN draws two cards, then discard two cards."
-            );
-        }
-        @Override
-        public void executeEvent(final MagicGame game, final MagicEvent event) {
-            game.doAction(new MagicDrawAction(event.getPlayer(),2));
-            game.addEvent(new MagicDiscardEvent(event.getSource(),event.getPlayer(),2));
-        }
-    }
-]

release/Magarena/scripts/Careful_Study.txt

@@ -5,5 +5,5 @@ value=4.354
 rarity=C
 type=Sorcery
 cost={U}
+effect=PN draws two cards, then discards two cards.
 timing=draw
-requires_groovy_code