magarena/release/Magarena/scripts/Haunter_of_Nightveil.groovy

[
    new MagicStatic(
        MagicLayer.ModPT,
        MagicTargetFilter.TARGET_CREATURE_YOUR_OPPONENT_CONTROLS
    ) {
        @Override
        public void modPowerToughness(final MagicPermanent source,final MagicPermanent permanent,final MagicPowerToughness pt) {
            pt.add(-1,0);
        }
    }
]