Hi Pastlebox, thanks for the comment! I'd be happy to answer any of your questions.

A. The turn I usually win on depends on a number of factors. Have I found a way to accelerate my game plan? If so, how? Did I get lucky and draw Cradle and Nykthos, or get my Crop Rotation? Did I draw Skyshroud Claim/Harrow, or Crucible + Azusa/Oracle? My deck wins by making lands untap, and it's important that my lands produce a minimum of 7 mana before I can go infinite and win. So how fast I get to that point is what matters the most. In a fast game, I find I can win usually around turn 4, sometimes turn 3. In a longer game, where a lot of removal has been directed at me, I'll have to get lucky with the cards I draw, and I'll win by hitting 7 lands the hard way, and having the Palinchron + Phantasmal Image I need. Usually, I find myself ready to win Turn 4, and winning turn 4.5-5. The deck isn't the fastest combo deck, but it's extraordinarily resilient, and has won multiple times after losing the board repeatedly.

B. We play in groups of 4. Sometimes the occasional Fifth will join us, but we try to stick to 4, as any more make the games go very long.

C. I used to run Lighthouse Chronologist in the deck. The problem with his ability is that for him to be useful, you need to sink 9 mana into him (7 Us and 1U for casting cost). That alone would take basically all of Turns 3-5 (assuming you can even tap all your lands for U, which is a high bar), and I'm busy winning the game then. And the moment that you spend a turn sinking mana into him, and someone removes him, all your effort becomes for naught. Basically, he's a high risk, high reward card, but the risk is much higher than the reward. He ends up becoming a win-more card. He's a fun card when you can proliferate his counters, but this isn't the right deck for him.

This is my personal preference, but I think Azami, Lady of Scrolls is much better than Fathom Mage. Or rather than tutor for Teferi in the end of your cycle, get Azami. That way you can tap Momir, Fathom, and Azami each turn to draw 3 cards a turn (untapping them each turn with Seedborn). That way, you can draw into a green creature to cast to get Teferi, and then get him to play.

Fathom Mage doesn't work for me because 82% of the creatures I run (27/33) have base power <3, and so she would not trigger often enough to make her useful. I would draw one, maybe two, rarely three cards, before she never does anything for me again. If she were two mana I'd run her, but at 4 I cannot justify such a high cost for so little return.

D. Finally, Master Biomancer doesn't do enough for me on his own to justify keeping him. I run zero +1/+1 counter things (except for Genesis Hydra) and no way to interact with them. I also never attack, and so having big creatures becomes nearly useless for me. The interaction between him and Glen Elendra is cute, but I cannot justify running an otherwise unnecessary 4-drop in the deck just so that my Glen Elendra can stick around for longer. Games don't usually take long enough for me to need more than 2 counters from her (plus all the others I have).

I hope this helps, and please let me know if you have any other questions!