Cheapest priced copy (Innistrad: Crimson Vow): $0.35 at Card Kingdom, near mint, their price list as of .
Ceremonial Knife 
Artifact — Equipment · Common · Innistrad: Double Feature · #521
Equipped creature gets +1/+0 and has "Whenever this creature deals combat damage, create a Blood token." (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 521 | Common | $0.59 | $0.99 |
| Innistrad: Crimson Vow | 254 | Common | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 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 2025You can't sacrifice a Blood token to pay multiple costs.
- 24 January 2025Some triggered abilities trigger "whenever you sacrifice a Blood token." These abilities trigger regardless of why you sacrificed that Blood token.