Each time you draw a card, you put a loyalty counter on it, and the tokens Teferi creates also get +1/+1 counters
Neither are ideal or complete solutions, but they would at least allow us to enjoy (a form of) Commander on MTG Arena sooner than having to wait for the entire catalog of relevant Magic cards to be uploaded onto the client
I've been playing Akiri, Fearless Voyager for years as my own Equipment commander specifically to encourage myself to Go Wide swinging with equipment instead of going Voltron as a self-imposed nerf to the deck and STILL it ends up correct to just pile on all my equipment on to a single creature most of the time
However, the more cards you have in your deck, the lower the chances of you drawing your best cards
The reason being, you can cast your rituals during your main phase, but then you can't cast Savage BeatingSavage Beating until combat, when all that mana will have drained from your pool