Converter Beast is a common Creature — Phyrexian Beast card from March of the Machine (MOM), collector number 180. Current market price: $0.23 (foil $0.29), TCGplayer market prices via Scryfall.
When this creature enters, incubate 5. (Create an Incubator token with five +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)