Rooftop Bypass is a rare Enchantment card from Assassin's Creed (ACR), collector number 298. Current market price: $5.55, TCGplayer market prices via Scryfall.
Whenever one or more nontoken creatures you control deal combat damage to a player, create a 1/1 black Assassin creature token with menace. (It can't be blocked except by two or more creatures.)