
+2: Exile the top three cards of target opponent's library.
−X: Put a creature card with mana value X exiled with Ashiok onto the battlefield under your control. That creature is a Nightmare in addition to its other types.
−10: Exile all cards from all opponents' hands and graveyards.
Ashiok, Nightmare Weaver has 2 printings, first in Theros (2013). EDHREC ranks it #11,198 among Commander cards. It appears most in Umbris, Fear Manifest decks (3,633 on EDHREC). It has 5 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.