magarena/release/Magarena/scripts/Seller_of_Songbirds.groovy

[
    new MagicWhenComesIntoPlayTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game, final MagicPermanent permanent, final MagicPayedCost payedCost) {
            return new MagicEvent(
                permanent,
                this,
                "PN puts a 1/1 white Bird 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("Bird1")));
        }
    }
]