I second Elk’s suggestion regarding Emissaries (they feel out of place here),
Disciple of the Ring (she’s a must have in any Ux control) and
Sire of Stagnation. Sire may have a slot in Sultai builds if you have some ways to ramp into him but without ramping he could be too late to have any real effect. Also, plenty of decks don’t rely on lands at all (RDW, boros aggro, most of aristocrats), especially past turn 6 when you cast him.
I’d suggest
Emeria Shepherd or
Alhammarret, High Arbiter instead – they are much more valuable as bombs and have instant effect on the battlefield.
Kothoped is also not bad as you don’t run a lot of life loss spells like
Read the Bones or
Bitter Revelation.
And regarding
Gideon's Reproach – it is the bee’s knees against aggro or midrange but can do sh*t about unflipped planeswalkers, so I’d suggest keeping these
Reave Souls to stop Jace or Nissa just in time.
Also, my suggestion would be adding more enchantment hate besides 2x
Angelic Edict. A few
Felidar Cubs, may be? I don’t know what platform are you playing on but on Steam there are currently more enchantments in high rank matches than ever. Evo Leaps, Retreats,
From Beyond, etc. And they really hurt control decks. I don’t know about you but I’d like to have an answer to them besides counter spells.
Planeswalkers also might be a problem with only 1x
Suppression Bonds and no
Disperse. Disperse is currently very underrated, IMHO, and I’m planning to run 2x or even 3x of it my own Esper which is currently in progress. Seriously – it can deal with enchantments, PWs, Ulamog (to counter it later if you don’t have any other answer), creatures with counters on them, etc. I totally love this card.
All in all - nice list, please contribute more