magarena/release/Magarena/scripts/Eyes_of_the_Wisent.groovy

[
    new MagicWhenOtherSpellIsCastTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicCardOnStack cardOnStack) {
            return (permanent.isEnemy(cardOnStack) && 
                    cardOnStack.hasColor(MagicColor.Blue) &&
                    permanent.isController(game.getTurnPlayer())) ?
                new MagicEvent(
                    permanent,
                    new MagicMayChoice(),
                    this,
                    "PN may\$ put a 4/4 green Elemental creature token onto the battlefield."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            if (event.isYes()) {
                game.doAction(new MagicPlayTokenAction(event.getPlayer(), TokenCardDefinitions.get("G Elemental")));
            }
        }
    }
]