Infernal Genesis is a rare Enchantment card from Prophecy (PCY), collector number 68. Current market price: $5.95 (foil $20.65), TCGplayer market prices via Scryfall.
At the beginning of each player's upkeep, that player mills a card. Then they create X 1/1 black Minion creature tokens, where X is the milled card's mana value.