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 - $12.75
Lightly Played - $12.00
Moderately Played - $9.50
Heavily Played - $7.75
Damaged - $5.25
Near Mint Non-English - $12.75
Lightly Played Non-English - $12.00
Moderately Played Non-English - $9.50
Heavily Played Non-English - $7.75
Damaged Non-English - $5.25