What a curious ability on a Rhythm creature. The only immediately obvious use I can see is giving several creatures summoning sickness in the opponent's declare attackers step.

Originally, she had Ray of Command as her ability, but that sort of theft isn't blue anymore. However, Rhythm is actually interesting here, as it still gives you the ability to untap the card unexpectedly and make a switch.

We'll see how it develops.

Not sure if this wacky ability works, but I wanted something clearly different than Sway of Opinion and Beguiler of Wills.

Would it be "fair" to be able to swap an excess land for an opponent's bomb or planeswalker? Or should it include "two permanents that share a type."?

Well, "fair" is not really my intent, but having the switched objects share a type would probably be appropriate.

Let it also be noted that this undercosted for the time being.

It should probably say controllers, not owners, especially since those will stop correlating after this starts activating.

That's a good point...

Reads kinda clunky. Should I bother specifying that the chosen permanents need to have different controllers? I mean, it's not like this does anything if you choose two permanents owned by the same person.

I suppose it's not necessary, but I'm sure there's some combo that only works if it doesn't specify controllers. I tried looking for precedents, but it seems all control-exchanging effects are between you and an opponent, never two players.

Well, Cultural Exchange just targets players. Maybe I should be using that structure.