(edh) i might need a bit of help, i'm stumped

here's my list peeps
https://deckbox.org/sets/789560
So what i want is to make this a more stable deck (and add some newer cards). its control that doesn't rely on my commander just when im out of cards sometimes and when i know she doesnt die (shes expensive i think). any cards are good but more creatures as spells, like if theres a creature that ponders i'd rather have the creature than ponder. also cards i want to add for sure so advice on what to take out is even more appreciated. cards are The Mimeoplasm, and clever imposter.