Thrummingbird is a uncommon Creature — Phyrexian Bird Horror card from Phyrexia: All Will Be One (ONE), collector number 432. Current market price: — (foil $2.87), TCGplayer market prices via Scryfall.
Flying Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)