Glissa, Herald of Predation is a rare Legendary Creature — Phyrexian Zombie Elf card from March of the Machine Promos (PMOM), collector number 226s. Current market price: — (foil $0.90), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, choose one — • Incubate 2 twice. (To incubate 2, create an Incubator token with two +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.) • Transform all Incubator tokens you control. • Phyrexians you control gain first strike and deathtouch until end of turn.