Stensia Outcast

Shroud, Pillage X (Whenever this creature deals combat damage to a player, exile the top X cards of that player's library. You may cast those cards until end of turn. You may spend mana as though it were mana of any color to cast them.)
At the beginning of your upkeep, add {b}{b}.
Whenever you cast a spell, if that spell's mana cost was paid for using any amount of black mana, you gain 1 life.