Cosmogoyf is a rare Creature — Elemental Lhurgoyf card from Edge of Eternities Promos (PEOE), collector number 215p. Current market price: $0.25 (foil $0.33), 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.