Equipped creature gets +1/+1 for each color among permanents you control.
As long as Conqueror's Flail is attached to a creature, your opponents can't cast spells during your turn.
Equip {2}
Near Mint - $9.30
Near Mint Non-English - $9.30
Lightly Played - $8.40
Lightly Played Non-English - $8.40
Played - $6.50
Played Non-English - $6.50
Heavily Played - $5.60
Heavily Played Non-English - $5.60
Damaged - $4.70
Damaged Non-English - $4.70