Magic Designer is a uncommon Creature — Human Gamer card from Unknown Event (UNK), collector number UC02. Current market price: $39.00, TCGplayer market prices via Scryfall.
When Magic Designer enters the battlefield, look at the top 10 cards of your library. You may reveal a playtest card from among them and put it into your hand, then put the rest on the bottom of your library in a random order.