Griffin Aerie is a uncommon Enchantment card from Wilds of Eldraine: Enchanting Tales (WOT), collector number 5. Current market price: $0.29 (foil $0.24), TCGplayer market prices via Scryfall.
At the beginning of your end step, if you gained 3 or more life this turn, create a 2/2 white Griffin creature token with flying.