Sage of Hours for unlimited turns

Looks great! My only recommendations (because they are some of my favorite Simic cards):

Momir Vig, Simic Visionary: He doesn't really help you get counters, but he does let you find creatures you need when you need them.

Progenitor Mimic: He can be an extra of any creature you want and put out more token versions. Which on something like Master Biomancer, things can get big and nasty fast!

And then Bioshift: It doesn't look too fancy, but it can be a real game changer!

I hope any of this helps! This gets a +1 from me :)

Thanks BrassGolem - all good suggestions.

Freyalise, Llanowar's Fury is amazing in this deck.

Your build is super similar to mine, with the exception of a few more expensive pieces that I don't have. Looks good though. +1

Here's mine if you're interested or have any suggestions. Count on Me -- Ezuri, Claw of Progress EDH

Hey, Prophet of Kruphix is no longer EDH Legal, so I'd try to swap that out for something similar...

Yeah, rockinon96 for a YEAR! Only found out last week. I'll look into it; ta, mate

really, it's already been a year?! hm... didn't notice. i'd look into Seedborn Muse, and Leyline of Anticipation...

What about Wizard Class for the infinite combo with Fathom Mage? You could also throw in Benthic Biomancer or Mindless Automaton for some secondary options.