Unfeeling Jailer

Whenever Unfeeling Jailer is tapped, you may pay {3}. If you do, exile target creature an opponent controls under it.
Unfeeling Jailer gets +1/+1 for each creature
exiled under it if you control a Cosmosa plane.
When Unfeeling Jailer dies, return all exiled
cards to their owner's graveyards.
Warp 6 — {4} (Warp into 4 Robot Drones)