When you use Mystical Reversal on a Catalyst spell, do you get to channel 2 exhausted, or does the target still refer to the original player?

Ruling: When you Mystical Reversal a Catalyst spell, you control the spell and follow its instructions, so you are the one who channels 2 exhausted.

Nuances:

• Mystical Reversal allows you to choose new targets for the spell you're stealing.