I know you've got your own thing going on here but I think tree of redemption doesn't do enough for a 4-drop. I also think running wall of omens would help you dig for fogs and your combo whilst still stone-walling creature decks.

Have you thought about trying to use something like nykthos to ramp into an earlier avatar? or running some number of other threat to help when your opponent has removal for avatar? Wurmcoil engine seems optimal but he's super expensive, maybe someting like myr  battlesphere? even just in the sideboard.

And I think you need some way to interact with combo decks but I can't think of anything to suggest

Otherwise, 10/10, will take down the next protour.