As long as Imperious Mindbreaker is paired with another creature, each of those creatures has “Whenever this creature attacks, each opponent mills cards equal to its toughness.”
Near Mint - $0.60
Lightly Played - $0.50
Played - $0.40
Heavily Played - $0.40
Damaged - $0.30
Near Mint Non-English - $0.60
Lightly Played Non-English - $0.50
Played Non-English - $0.40
Heavily Played Non-English - $0.40
Damaged Non-English - $0.30