Infected Defector is a common Creature — Phyrexian Knight card from March of the Machine (MOM), collector number 18. Current market price: $0.16 (foil $0.26), TCGplayer market prices via Scryfall.
When this creature dies, 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.)