magarena/release/Magarena/scripts/Steel_Overseer.groovy

[
    new MagicPermanentActivation(
        new MagicActivationHints(MagicTiming.Pump),
        "Pump"
    ) {
        @Override
        public Iterable<MagicEvent> getCostEvent(final MagicPermanent source) {
            return [
                new MagicTapEvent(source)
            ];
        }
        @Override
        public MagicEvent getPermanentEvent(final MagicPermanent source,final MagicPayedCost payedCost) {
            return new MagicEvent(
                source,
                this,
                "Put a +1/+1 counter on each artifact creature you control."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final MagicPlayer player = event.getPlayer();
            final Collection<MagicPermanent> targets =
                game.filterPermanents(player,MagicTargetFilter.TARGET_ARTIFACT_CREATURE_YOU_CONTROL);
            for (final MagicPermanent target : targets) {
                game.doAction(new MagicChangeCountersAction(
                    target,
                    MagicCounterType.PlusOne,
                    1,
                    true
                ));
            }
        }
    }
]