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.”
NM-Mint - $0.40
Lightly Played - $0.40
Moderately Played - $0.30
Heavily Played - $0.30
Damaged - $0.30
NM-Mint Non English - $0.40
Lightly Played Non English - $0.40
Moderately Played Non English - $0.30
Heavily Played Non English - $0.30
Damaged Non English - $0.30