Syphon Essence is a common Instant card from Innistrad: Double Feature (DBL), collector number 351. Current market price: $0.22 (foil $0.38), TCGplayer market prices via Scryfall.
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.")