Aethersnatch

If you gain control of a commander spell, the commander’s owner chooses whether to put it in the command zone if it later leaves the battlefield.

You may change any or none of the spell’s targets. If you change a target, you must choose a legal target for the spell. If you can’t, you must leave the target unchanged (even if the current target is illegal). Notably, if you were originally chosen as a “target opponent” for a spell you gain control with Aethersnatch, you are now an illegal target as you aren’t your own opponent.

Aethersnatch can target any spell, even one without targets.