The Prince of All Cosmos

When The Prince ETBs, you may exile a nonland permanent with CMC less than or equal to 1 plus
The Prince's CMC.
{4}: Roll Up! (You may exile a nonland permanent
with CMC less than or equal to 1 plus the CMC
of another card exiled with The Prince.)
When The Prince LTBs, return all cards exiled
with The Prince under their owners' control.