Polis

Yes much better! Pearl is very strong. One or two aetherspouts could replace a dig through time and jace's. I think you might find you have too many digs, they are great but graveyard intensive.

Your win condition is very, very, very slow. A legendary creature means you can only have one out at a time and it only has 4 toughness. The maximum damage you have in spells is 12 from 4 different lightning strikes.

Maybe revisit your win con here, look into some other control like banishing light, Aetherspouts, Polymorphists Jest, etc. You need more spells that target creatures, IMO, rather than spells. If you face a temur deck that is running as intended or a jeskai tokens you will be facing game winning turn 3 drops with no response except a potential nullify if you did not go first or you are stuck with a tapland down.

Don't get me wrong, though, I love control, just trying to help with what could and will happen with some frequency.

My friend had the same issue with his Temur deck. I convinced him to take those out.

That makes sense late game.

Seeker is an amazing card! But yes you would have to go white. Not using white is going to hurt your deck strength, though.

I'd take out those whirlwind adepts, they are just not good. Jeskai windscouts are better than both the bloodfire experts and whirlwind adepts.

Think of both hordeling outbursts to trigger jeskai ascendancy and treasure cruise in the place of whirling adepts. 2xhordeling and 1x treasure. If you can find room for 2x treasure and 3xhordling I'd do that.

I would suggest seeker of the way over whirlwind or bloodfire.

Since you are creature heavy, 1 or 2 aqueous forms would be great.

Also, treasure cruise for budget draw.

Mantis rider is a great card, consider that as well. Probably better than swiftspear but I see what you are doing with prowess. Mantis may not fit as well but a consideration.

Any reason to do rattleclaw over caryatid? Budget concerns?

I love spiteful returned, totally undervalued. I would put on some draw cards, read the bones for instance. Kruphix's insight is good but you may end up having to toss cards you need, like Kheru.

Since Kheru lich-lord is a bit slow, I would suggest adding in Rescue from the Underworld. Also, turn 1 despise never hurts against tempo.

Oh, also check out Sultai Ascendancy if you find the wayfinders and commune milling yourself too fast.

I liked the other deck to try to get it ranked higher. Sidisi is just so much fun!

How is Nyxweaver working for you? (If you played around with this deck) It seems pretty good with Sidisi out, but without Sidisi does it pull its weight?

No shame in having a budget! I was only asking so I don't recommend too expensive of cards! What is your max budget like? $25-$30?

Love constellation as a mechanic. Are you on a budget? I have some suggestions, like nixing flitterstep and putting in either stratus walk and/or aqueous form. They are both mostly better than flitterstep and proc constellation.

Also, check into a doomwake giant or two.

What about adding read the bones? I think SOME card draw would do wonders with this deck, especially since you mill and whip. The scry on read the bones is very helpful.

Nyxweaver is only partially helpful, you have a lot of mill already. Courser or eidolon of blossoms would be good but is expensive. If you are sticking to a tight budget and find yourself with too many mill cards maybe just sub in some elvish mystics.

Or lean towards control with thoughtseize or despise for less $$ and/or ulcerate.

Whipping hornet queen is a bunch of the top decks right now.

Take a look at warriors' lesson and savage punch for some added card draw and green "removal". Both are cheap $ wise.

Heliod's Pilgrim would make it more feasible although it is not infinite.

Would bioshift be an annoying trick you could use? Especially if you sneak in a small hydra then bioshift all those tokens onto his head.

I like the idea of this deck; are you sticking to a certain budget?

Some cards to consider:
Bioshift
Dissolve instead of Cancel
Bow of Nylea for counters and death touch
Nylea for trample to replace crowned ceratok
Cyclonic Rift instead of Disperse (if you have the extra $$)

Edit: Oh yea, Primordial Hydra in your sideboard is not Standard Legal if you are worried about that.