[
    new MagicPermanentActivation(
        new MagicActivationHints(MagicTiming.Counter),
        "Counter"
    ) {

        @Override
        public Iterable<MagicEvent> getCostEvent(final MagicPermanent source) {
            return [new MagicSacrificeEvent(source)];
        }

        @Override
        public MagicEvent getPermanentEvent(final MagicPermanent source,final MagicPayedCost payedCost) {
            return new MagicEvent(
                source,
                MagicTargetChoice.NEG_TARGET_SPELL,
                this,
                "Counter target spell\$ unless its controller pays {1}."
            );
        }

        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            event.processTargetCardOnStack(game,new MagicCardOnStackAction() {
                public void doAction(final MagicCardOnStack targetSpell) {
                    game.addEvent(new MagicCounterUnlessEvent(event.getSource(),targetSpell,MagicManaCost.create("{1}")));
                }
            });
        }
    }
]