Kinzu of the Bleak Coven is a rare Legendary Creature — Phyrexian Vampire card from Phyrexia: All Will Be One (ONE), collector number 406. Current market price: $0.36 (foil $0.70), TCGplayer market prices via Scryfall.
Flying Whenever another nontoken creature you control dies, you may pay 2 life and exile it. If you do, create a token that's a copy of that creature, except it's 1/1 and has toxic 1. (Players dealt combat damage by it also get a poison counter.)