Flusterstorm (Mystical Archive JPN) Finish:Nonfoil Flying Unearthly Power — Instant

Flying Unearthly Power — Instant and sorcery spells you cast cost {1} less to cast for each creature token you control

Whenever Grist or another creature you control enters

Destroy X target artifacts and/or creatures

Sacrifice this token: Exile the top card of your library

you may exile a black card from your hand rather than pay this spell's mana cost

Flusterstorm (Mystical Archive JPN) Finish:Nonfoil Flying Unearthly Power — InstantCounter target instant or sorcery spell unless its controller pays {1}. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)