hi, i would start by focusing on your win conditions. For example, if you're looking to eventually generate infinite mana, might wanna toss in
Blue sun's zenith or
suture priest (so you can create infinite hippos and kill everyone with them!) Also, i think trying to ruthlessly pare down nonessentials like
sterling grove or world
purge would help focus - i feel like if you only have 13 enchantments,
sterling grove may not pull its weight, if you want the tutor effect, how about
enlightened tutor? it can get artifacts as well.
Worldpurge seems like it'd hurt you a lot too, maybe use
cyclonic rift or
wash out to focus the board wiping and not hurt yourself. I've played Pheldagriff before and found that
Reins of Power is a really great surprise and can win you the game on the spot. With all the group draw, wumpus and benefactor, people will rush out their best creatures, then you can grab 'em and hit 'em for lethal when the moment's right! If you can find or afford it,
angus mackenzie can be a more permanent replacement for instant fogs. Cannot recommend
Capsize enough, especially with
prophet of kruphix and mana doublers. To help the weak, maybe
Silent Arbiter to keep creatures under control. If I was cutting cards, I'd probably cut
wall of shards,
divine presence, world
purge,
tornado,
sterling grove and maybe cut those 3 balancing spells at the end. I feel like you may need a lot of board wipes to help deal with all the noble benefactor-type effects and keep the aggro decks in check until you decide to end things. Best of luck and may the hippos fly!