Cheapest priced copy (Crimson Vow Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Arterial Alchemy 
Enchantment · Rare · Crimson Vow Commander · #23
When this enchantment enters, create a Blood token for each opponent you have. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
Blood tokens you control are Equipment in addition to their other types and have "Equipped creature gets +2/+0" and equip {2}.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Crimson Vow Commander | 23 | Rare | $0.99 | — |
| Crimson Vow Commander | 61 | Rare | $0.99 | — |
6 rulings from Wizards of the Coast
- 19 November 2021If a Blood token is somehow both a creature and an Equipment, it can't be attached to a creature.
- 19 November 2021If you control more than one Arterial Alchemy, creatures equipped with Blood Equipment will get +2/+0 for each Arterial Alchemy. The equip cost is still {2}.
- 19 November 2021Blood tokens stop being Equipment if Arterial Alchemy leaves the battlefield. If any of them are attached to creatures at that time, they become unattached.
- 24 January 2025You can't sacrifice a Blood token to pay multiple costs.
- 24 January 2025If an effect refers to a Blood token, it means any artifact token with the subtype Blood, even if it has gained other subtypes.
- 24 January 2025Some triggered abilities trigger "whenever you sacrifice a Blood token." These abilities trigger regardless of why you sacrificed that Blood token.