Does the Possession card awaken (ready) an exhausted unit, or does it stay exhausted when moved to the enemy base?

Ruling: Possession does not ready the unit you're gaining control of. If it was already readied, it stays readied. If it was exhausted, it stays exhausted.

Nuances:

• Some units have abilities that ready them (e.g., Darius readies when you cast a second spell), but that's not related to Possession itself
• An exhausted unit's only restrictions are: you cannot exhaust it for costs/effects and you cannot move it with a Standard Move Action
• If you use a spell or effect (like Ride the Wind, Yasuo Unforgiven, or Zenith Blade) to move an exhausted unit into a battlefield, it can still conquer