Monfrix, of Unspeakable Vility

As long as you own a card in exile, Monfrix gets
+1/+1 and has hexproof and menace.
Whenever you sacrifice a creature, it is exiled
instead of being put into a graveyard.
{b}{b}{b}, {t}, Sacrifice two creatures: Choose one --
- Target player gains 6 life.
- Target player loses 6 life.
- Target player exiles the top 6 cards of his or her library.