Wrong Wrong Wrong.. all of these ideas can be manipulated by one to an unfair advantage.

You teleport back to the closest teamate or team - middle of gunfire you die, get stuck in vents, or walls etc..

Teleport to spawn - get hosties nd gg..

Teleport to a place where you died - Enemy spawn every time or right behind where they usually face the my team.. or Bombsite.. plant gg.

My idea -

Re do the whole class-
Instead of crow being an ability, let it be an ultimate. Something like warden except you come back as a crow 100% of the time. Also let crow walk/fly only when pressed ultimate again. Its nearly impossible to kill in the air, especialy with 5/7.
For other 3 abilities.. idk get creative, come up with something that would fit a "magician".