Creature -- Demon
Embodiment of Agonies enters the battlefield with a +1/+1 counter on it for each different mana cost (note: not converted mana cost) among nonland cards in your graveyard.
So to be clear, I don't think a straight beater is playable in Vintage anymore. And if I did, I'm not sure this guy is better than, say, Tombstalker. But the textbox here is so unusual I wanted to call attention to it.
Unlike Tarmogoyf, the power/toughness of Embodiment is locked in when you cast him; in the mid- to late-game, though, you get an awful lot of evasive body for three mana, even if you're not purposefully stocking the graveyard with Bazaar, dredging, etc.