magarena/release/Magarena/scripts/Chasm_Drake.groovy

[
    new MagicWhenAttacksTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPermanent creature) {
            return (permanent == creature) ?
                new MagicEvent(
                    permanent,
                    MagicTargetChoice.TARGET_CREATURE_YOU_CONTROL,
                    MagicFlyingTargetPicker.create(),
                    this,
                    "Target creature\$ you control gains flying until end of turn."
                ):
                MagicEvent.NONE;
        }

        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            event.processTargetPermanent(game,new MagicPermanentAction() {
                public void doAction(final MagicPermanent creature) {
                    game.doAction(new MagicGainAbilityAction(creature,MagicAbility.Flying));
                }
            });
        }
    }
]