Encantamiento
Al comienzo de tu mantenimiento, puedes intercambiar el control del permanente objetivo que no sea tierra que controlas y el permanente objetivo que no sea tierra que controla un oponente que tenga un coste de maná convertido igual o menor.
You choose two targets such that as a set, all of the targeting conditions are met. That means, for example, that if you control a nonland permanent whose mana value is lower than any of your opponents' nonland permanents, you can't choose it as a target. (If you did, you'd be unable to choose a second target.)