Nascent Metamorph is a rare Creature — Shapeshifter card from Commander 2020 (C20), collector number 36. Current market price: $0.29, TCGplayer market prices via Scryfall.
Whenever this creature attacks or blocks, target opponent reveals cards from the top of their library until they reveal a creature card. This creature becomes a copy of that card until end of turn. Then that player puts all cards revealed this way on the bottom of their library in a random order.