If you are having trouble against Control and Grixis Shadow, you should probably run more Voice of Resurgence. It's the best card to use for Eldritch Evolution anyway, and really makes life difficult for decks that use countermagic, spot removal or attacks on the ground.
I personally run 4 Voices in my Saheeli list and would play 6 or 7 if I was allowed to do that. There are some matchups where it's basically a Grizzly Bear, like Storm or Affinity, but in many other matchups drawing multiple Voices gives you a very high chance of winning. At the very least, most opponents will need to deal with the Voice(s), thus creating opportunities for your other, slower cards. If they have to Path to Exile it on turn 2 or 3 (on their own turn too), you get to untap with a lot of mana.
Another great tool to beat grindy decks is Tireless Tracker. I only run one, but it's a fantastic stand-alone threat that can generate serious card advantage and pressure without overextending into a Supreme Verdict, All Is Dust or the like.

Emzed I have seen that other lists run more Voices, but for now i really don't see reason for it. Tireless Tracker should be on "Honorable Mentions" i just forget to add him.

In your own deck description you mentioned some bad matchups, and Voice is very good against serveral of those. So there is your reason to play the full 4 :D
Honestly, Wall of Omens is okay, but Voice is so much better in my experience. A 0/4 blocker is just rarely relevant in a metagame dominated by Storm, Eldrazi, UW Control, Death's Shadow, Company and Affinity. Voice is actively good against some of those decks, and attacks for at least 2 damage against the others, more if you can get it to die.

Just a point I think you missed in the description, if you have one saheeli out and one in the graveyard (or two in the GY), you can go infinite by tutoring up sun titan, getting back saheeli, duplicating sun titan, and getting back a new saheeli. The only issue with this is that you seem a bit short on 4 cmc creatures that can find sun titan.

jld592 I have not think about that, but yes it does go infinite.

i think you should try using a 2 mana creature like Sylvan Caryatid harder for opponent to get rid of and can produce mana for evolution to get felidar guardian, he is also a good blocker in aggro matches.

frogkill45 2 cost mana dork? No thanks. If i want more mana dorks i would play Noble Hierarchs.

You know 2 mana dude that just produces mana is not even close enough good for this deck, it is so terribly slow. Yes Hexproof is very good but still, it's power level isn't enough for Modern (Usually). Mostly Wall of Omens takes this slot as better blocker and overall drawing card is just better.

If you think about decks other 2 drops:

Lotus Cobra Can produce huge amount of mana with fetchlands.

Voice of Resurgence Maybe best value creature in whole Modern format.

Scavenging Ooze Our main deck hope against Storm and Dredge, bit situational but still very important.

Wall of Omens Doesn't seem like amazing, but blocks much better and draws card which is so good.

Thanks for you suggestion, but there is reason that 2 cost mana dorks are not played in Modern too much.

Sylvan Caryatid becomes a little more interesting if you run Worship since it rarely dies in the matchups where you want Worship and it accelerates you nicely into the 4 mana enchantment. But that's about the only real reason pro Caryatid, it's just not what this deck needs, since you want to ramp into 3-drops.

Emzed That is then whole different thing. Worship is of course option but i don't just think it fits in here. Deck would have to be changed a lot.

In my experience Worship is a great sideboard card against decks like Burn, Merfolk, Dredge, Living End, Death and Taxes, some versions of Elves and other Aggro or Combo decks. I like it against Affinity too, even if they still have Inkmoth Nexus to get around it. You can adapt your deck a little to accomodate Worship, such as Courser of Kruphix to keep fetchlands online once you're at 1 life (your list even has two Coursers already), but it's not really necessary. Worship is good enough on its own in a deck with this many creatures against most linear, damage based decks. They can rarely beat it, and neither can they prevent you from eventually winning via combo.

Nice deck.

Your primer doesn't mention (as far as I could see) that Sun Titan also goes infinite with Saheeli if there one on the board and one in the grave, and also if there is just two Saheeli the grave. I've found that it's not uncommon with Saheeli decks to have 2 of them destroyed, and then being able to slam a single Sun Titan (For example with eldritch on your guardian) and go infinite is pretty awesome.

Sjorpha I do know that and someone mentioned it in earlier comments, looks like i totally forget to add it in the primer, my bad!

would you be able to add a steam vents? what land would you cut?

swagfrog You could cut Razorverge Thicket or Reflecting Pool, but i feel like the deck doesn't need more shocks and it doesn't want to cut any. But still i could see playing Steam Vents in place of either one i mentioned.

I think Chandra, Torch of Defiance can go in instead of something. Kiki Jiki? Or do you need kiki to combo with felidar.

swagfrog Chandra, Torch of Defiance has been in testing for quite a while in sideboard and i very rarely board her in. No i'm not cutting Kiki-Jiki, Mirror Breaker because this deck needs way to go around things like Meddling Mage (Humans are super popular) and it's way to go off with Eldritch Evolution as it doesn't find Saheeli Rai.

I myself love Chandra and want to play her so i might test her in main deck just as value card. Scavenging Ooze Might be card to cut and put it in the sideboard. I still have to think what to cut in sideboard then. Maybe 4th Path to Exile is one card that i could cut from board.

Thanks for replying. I understand. Thanks for telling me.

Is there a reason not to have a copy or two of pestermite or deceiver exarch?

MWorl91 This isn't really Kiki-Jiki, Mirror Breaker based deck and i don't want dead cards in my deck. It's simple as that. Pestermite and Deceiver Exarch are straight up dead cards outside of combo.

I've played a style similar to this and after looking at your list I think I'll go explore using the new Militia Bugler to reap some value. It actually digs for felidar and is an extra payoff for it when it etbs without saheeli around. An extra way to grind a game or dig maybe? Cool list, good luck with your playtesting!

UUUUmage Militia Bugler could be playable but it feels bit slow, it would be better in more value based deck without combos i feel like. I could playtest it, i do own few copies it already anyway. And thanks you!

Your upvote botton is a link to a different 4c shaeeli evolution deck. Do you know why? Maybe it's just my computer.

Flooremoji Thanks you for pointing that out, Tappedout has done something weird again it seems because that happened very recently, but its fixed now.

What are your thoughts on Nissa, Steward of Elements? The card looks sweet, but I haven't played with her at all. How has she been working for you?

Pieguy396 She is still on testing, but i have liked her so far. I have played lot against Storm and Burn lately where she isn't on her best so its hard to say really but i recommend to test her.