You and target player exchange control of the creature you each control with the highest mana value. Then exchange control of artifacts the same way. If two or more permanents a player controls are tied for highest, their controller chooses one of them.
Near Mint - $0.95
Lightly Played - $0.90
Moderately Played - $0.71
Heavily Played - $0.57
Damaged - $0.38
Near Mint Non-English - $0.95
Lightly Played Non-English - $0.90
Moderately Played Non-English - $0.71
Heavily Played Non-English - $0.57
Damaged Non-English - $0.38