Juxtapose

Sorcery, 3U (4)
You and target player exchange control of the creature you each control with the highest converted mana cost. Then exchange control of artifacts the same way. If two or more permanents a player controls are tied for highest cost, their controller chooses one of them.¹
Illus. Justin Hampton

Crystal Keep Rulings Summaries

• The choices of what to exchange are made on resolution. They are not made on announcement. [bethmo 1996/12/07]
• Must trade creatures and artifacts if possible, but can trade just one kind or neither kind if none are available to trade. [Aahz 1994/06/16]
• Does not target either creature. So the spell allows you to choose creatures with Protection from Blue when making the choice of highest cost creatures. [Aahz 1995/10/24]
• Note - Also see Converted Mana Cost, Rule G3.29.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (4/15)	Classic Sixth Edition (Rare) Fifth Edition (Rare) Chronicles (Rare) Legends (Rare)