Glistening Dawn is a rare Sorcery card from March of the Machine Promos (PMOM), collector number 187p. Current market price: $0.29 (foil $0.15), TCGplayer market prices via Scryfall.
Incubate X twice, where X is the number of lands you control. (To incubate X, create an Incubator token with X +1/+1 counters on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)