Cosmogoyf is a rare Creature — Elemental Lhurgoyf card from Edge of Eternities Promos (PEOE), collector number 215s. Current market price: — (foil $0.75), TCGplayer market prices via Scryfall.
Cosmogoyf's power is equal to the number of cards you own in exile and its toughness is equal to that number plus 1.