Progenitor Exarch is a rare Creature — Phyrexian Cat Cleric card from March of the Machine (MOM), collector number 32. Current market price: $0.35 (foil $0.39), TCGplayer market prices via Scryfall.
When this creature enters, incubate 3 X times. (To incubate 3, create an Incubator token with three +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.) {T}: Transform target Incubator token you control.