magarena/release/Magarena/scripts/Arcbound_Overseer.groovy

[
    new MagicAtUpkeepTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPlayer upkeepPlayer) {
            return permanent.isController(upkeepPlayer) ?
                new MagicEvent(
                    permanent,
                    this,
                    "PN puts a +1/+1 counter on each creature " +
                    "with modular he or she controls."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final MagicPlayer player = event.getPlayer();
            final Collection<MagicPermanent> targets =
                    game.filterPermanents(player,MagicTargetFilter.TARGET_MODULAR_CREATURE_YOU_CONTROL);
            for (final MagicPermanent target : targets) {
                game.doAction(new MagicChangeCountersAction(
                    target,
                    MagicCounterType.PlusOne,
                    1,
                    true
                ));
            }
        }
    }
]