Burn at the Stake is a rare Sorcery card from Avacyn Restored (AVR), collector number 130. Current market price: $1.04 (foil $4.30), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, tap any number of untapped creatures you control. Burn at the Stake deals damage to any target equal to three times the number of creatures tapped this way.