Whirlwind Denial (Foil Etched) [Strixhaven: Mystical Archive] Nightmare Demon you may cast a legendary

you may cast a legendary spell from your hand

Set: Planechase 2012 Planes Type: Plane — Equilor Common Cost: Whenever a creature enters the battlefield

Set: Weatherlight Type: Instant Common Cost: {4}{B}{B} You may exile the top three black cards of your graveyard rather than pay this spell's mana cost

If you have any doubts

Deck storage box

Whirlwind Denial (Foil Etched) [Strixhaven: Mystical Archive] Nightmare Demon you may cast a legendarySet: Strixhaven: Mystical Archive Type: Instant Rarity: Uncommon Cost: {2}{U} For each spell and ability your opponents control, counter it unless its controller pays {4}. "If they try to storm your palace, you must become the storm." Handbook of Imperial Spellcraft