def PsionicDamage = new MagicPermanentActivation(
    new MagicActivationHints(MagicTiming.Pump),
    "Damage"
) {

    @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,
            MagicTargetChoice.NEG_TARGET_CREATURE_OR_PLAYER,
            new MagicDamageTargetPicker(2),
            this,
            "SN deals 2 damage to target creature or player\$ and 3 damage to itself."
        );
    }

    @Override
    public void executeEvent(final MagicGame game, final MagicEvent event) {
        final MagicPermanent source=event.getPermanent();
        event.processTarget(game,new MagicTargetAction() {
            public void doAction(final MagicTarget target) {
                game.doAction(new MagicDealDamageAction(
                    new MagicDamage(source,target,2)
                ));
                game.doAction(new MagicDealDamageAction(
                    new MagicDamage(source,source,2)
                ));
            }
        });
    }
};

[
    new MagicStatic(
        MagicLayer.Ability,
        MagicTargetFilter.TARGET_SLIVER
    ) {
        @Override
        public void modAbilityFlags(final MagicPermanent source,final MagicPermanent permanent,final Set<MagicAbility> flags) {
            permanent.addAbility(PsionicDamage);
        }
    }
]