Dauntless Dismantler is a uncommon Creature — Human Artificer card from The Lost Caverns of Ixalan (LCI), collector number 8. Current market price: $0.28 (foil $0.40), TCGplayer market prices via Scryfall.
Artifacts your opponents control enter tapped. {X}{X}{W}, Sacrifice this creature: Destroy each artifact with mana value X.