I was about to tell to replace Lightning Greaves with Swiftfoot boots, since you might want to target Baba Lysaga a lot, but then realize this combo exist:
https://commanderspellbook.com/combo/5050/

We have Bog Witch but it's not really impressive

I wonder if Squandered Resources would be good here, as another way to get fast mana and keep loops going. I feel it's too much land sac. I would add SR only if you're playing Natural Balance or similar. What will suit this deck is converting cards in hand into mana, like Cadaverous Bloom does. Any...

Other recent cards worth exploring:
Mishra's Foundry
Biotransference
Somehow, I feel that cards over 5MC are very hard to play in this deck, since lands are going to be sacced and you want to give fodder for Baba to user her ability

Liking this deck a lot. Tested a game with it last night and felt like I need to get the turn order right, but in terms of sac fodder, using lands hurts. Wondering if maybe Shigeki, Jukai Visionary , Skola Grovedancer , or Tymaret, Chosen from Death might be good ways to get a little more types on ...

Two great sacrifice fodder are Wishclaw talismand and Order of Nylea.
The first can be used to tutor, then break it to avoid retaliation.
The second is a very good ramp addition

This is a very nice list, I will try it myself with very few modifications. https://www.moxfield.com/decks/Aki6xck1j06fcSDMHi9I-g One upgrade that I see very clearly is Syr Konrad instead of Vindictive Vampire, for just one mana this adds much more dmg. (I tend to run very few lands, I probably shou...