Thanks for the detailed suggestions! I initially did have all of those hexproof creatures in the deck, but through playtesting in my group I found that I would constantly be going for a more voltron style game and the purely hexproof bases didnt really give me much to work with offensively. With that, I trimmed down all those cheap hexproof only cards and was left only with Elusive Tormentor  ^Flip, Slippery Bogbonder, and Swiftfoot Boots. If Swiftfoot Boots can stick, then all hexproof bases drawn are dead cards. The Bogbonder is definitely swappable since it's human, but giving Predator Ooze or Blight Mamba a hexproof counter and moving 6 counters from a tutored Polukranos in one play is pretty fun jank. That said, I will continue to test; I think there is a very good case to be made for the trolls especially.

I should also note that in around 7 games with this deck I have yet to cast Brokkos. Auspicious Starrix and Sawtusk Demolisher are easier to cast 6/6 trample mutates that give additional mutate effects and can be recurred with Otrimi's triggered ability. I may actually remove Brokkos if I don't get use out of him in my next few playtests.