Yes, they're actually putting some expensive cards in these decks, manabase is still a bit questionable unless you're getting an Universes Beyond deck apparently.

Maybe Vivien, Monsters' Advocate ?

Somewhat expensive for what it does, but I still add it to as many decks as I can. It is the card that comes to mind when I think of jank you would only play in EDH.

I used to play Runehorn Hellkite as a budget wheel a long time ago. I still see it from time to time, but I always cut it from my decks. Maybe I should try it with Anje Falkenrath or Chainer, Nightmare Adept.

I want to try it in Yawgmoth, Thran Physician, since you can proliferate the energy counters and you're going to sacrifice a lot of tokens anyways.

I suggest focusing on 1 of the commanders and dropping the rest(Unless they work well with the strategy you want to use). For example, if I want to focus on new Chainer, I'd cut a decent amount of the madness cards and add more value creatures. Another easy way to improve these decks is manabase and...