Conspiracy is a rare Enchantment card from Assassin's Creed (ACR), collector number 88. Current market price: $0.39 (foil $0.51), TCGplayer market prices via Scryfall.
As this enchantment enters, choose a creature type. Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.