When Arterial Alchemy enters the battlefield, create a
Blood token
(A Blood token is an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.") for each opponent you have.
Blood tokens
(A Blood token is an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.") you control are Equipment in addition to their other types and have "Equipped creature gets +2/+0" and
equip (: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.).