magarena/release/Magarena/scripts/Heart_Sliver.groovy

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