Inquisitor's Flail is a uncommon Artifact — Equipment card from Innistrad (ISD), collector number 227. Current market price: $1.06 (foil $8.69), TCGplayer market prices via Scryfall.
If equipped creature would deal combat damage, it deals double that damage instead. If another creature would deal combat damage to equipped creature, it deals double that damage to equipped creature instead. Equip {2}