Flames of the Blood Hand is a uncommon Instant card from Betrayers of Kamigawa (BOK), collector number 101. Current market price: $0.29 (foil $1.53), TCGplayer market prices via Scryfall.
Flames of the Blood Hand deals 4 damage to target player or planeswalker. The damage can't be prevented. If that player or that planeswalker's controller would gain life this turn, that player gains no life instead.