Sanguine Spy
{2}{B}Creature — Vampire Rogue
Menace, lifelink {1}, Sacrifice another creature: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.) At the beginning of your end step, if there are five or more mana values among cards in your graveyard, you may pay 2 life. If you do, draw a card.