i had a progenitus deck before this so im using him so that people dont see it coming.
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u need some way to give it trample or kill off defense, otherwise u will mill yourself to death before u can hit ur opponent
mill usually wont do anything to a deck with multiple mythic eldrazi because when they go to the graveyard the entire graveyard goes into the library. also grindstone wont do much if alot of the deck is colorless, ide put some suffer the past in place of the grindstone to exile the mythics from the graveyard in response to the ability shuffling it into the library.