Enigmatic Incarnation is a rare Enchantment card from Theros Beyond Death Promos (PTHB), collector number 215p. Current market price: $0.30 (foil $1.15), TCGplayer market prices via Scryfall.
At the beginning of your end step, you may sacrifice another enchantment. If you do, search your library for a creature card with mana value equal to 1 plus the sacrificed enchantment's mana value, put that card onto the battlefield, then shuffle.