You may have Progenitor Mimic enter the battlefield as a copy of any creature on the battlefield except it gains "At the beginning of your upkeep, if this creature isnt a token, put a token onto the battlefield thats a copy of this creature."

You may have Progenitor Mimic enter the battlefield as a copy of any creature on the battlefield, except it gains "At the beginning of your upkeep, if this creature isnt a token, create a token thats a copy of this creature."