Walk With the Void

When Walk With the Void enters the battlefield,
exile the top ten cards of your library. At the
beginning of your end step you may cast a card
from exile without paying its mana cost.

{2}{b}, {t}: Exile the top four cards of your library.

{b}{b}{b}{b}{b}{b}{b}: Exile Walk With the Void from
the graveyard, exile each nonland permanent a
opponent controls.