Cheapest priced copy (Innistrad: Double Feature): $0.35 at Card Kingdom, near mint, their price list as of .
Syphon Essence 
Instant · Common · Innistrad: Double Feature · #351
Counter target creature or planeswalker spell. Create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 351 | Common | $0.35 | $0.49 |
| Innistrad: Crimson Vow | 84 | Common | $0.35 | $0.49 |
4 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 2025Some spells that instruct you to create a Blood token require targets. You can't cast these spells without choosing all required targets, and if all of those targets become illegal targets, the spell won't resolve and you won't create any Blood tokens. If some but not all of those targets become illegal, you'll do as much as possible, including creating Blood tokens.
- 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.