Conqueror's Flail is a rare Artifact — Equipment card from Double Masters 2022 (2X2), collector number 302. Current market price: $3.72 (foil $5.32), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1 for each color among permanents you control. As long as this Equipment is attached to a creature, your opponents can't cast spells during your turn. Equip {2}