magarena/release/Magarena/scripts/Rootborn_Defenses.groovy

[
    new MagicSpellCardEvent() {
        @Override
        public MagicEvent getEvent(final MagicCardOnStack cardOnStack,final MagicPayedCost payedCost) {
            return new MagicEvent(
                cardOnStack,
                this,
                "Populate. Creatures you control gain indestructible until end of turn."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            game.addEvent(new MagicPopulateEvent(event.getSource()));
            final Collection<MagicPermanent> targets = game.filterPermanents(
                event.getPlayer(),
                MagicTargetFilter.TARGET_CREATURE_YOU_CONTROL
            );
            for (final MagicPermanent creature : targets) {
                game.doAction(new MagicGainAbilityAction(creature,MagicAbility.Indestructible));
            }
        }
    }
]