Ashiok, Nightmare Weaver
{1}{U}{B}
Legendary Planeswalker -- Ashiok
3
[+2]: Exile the top three cards of target opponent's library.
[-X]: Put a creature card with mana value X exiled with ~this~ 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.