Dies to Removal

I dislike.

I wish there were a good engine for card draw. Mentor of the Meek is okay but he's a three drop. Maybe Immortal Servitude is unnecessary?

Immortal Servitude/Proclamation of Rebirth is what gives the deck its resilience. It's part of what makes it competitive. I believe taking out that component would be folly.

Granted, one might argue that it's not as important here as in dedicated Martyr-Proc, and that's true, but given all the removal in the current Modern, recursion on any of your
creatures is an incredible advantage.

In a deck with fourteen one-drops, running four non-plains doesn't seem too risky. I haven't had many issues, but I could just be getting lucky. You make a good point about Flagstones, though. And running another Ghost Quarter probably wouldn't hurt.

Sisters are the cornerstone of the deck. I'd not run any less than eight, myself, but I suppose that could be just preference. I just really like beating down with huge pridemates.

Aven Mindcensor does good work in a lot of places, but in all of my testing, it never really did much for me aside from sometimes making people miss their fetchland pops. I don't like running cards that only sometimes do their job. If my opponent Mystical Teachings and their Teferi, Mage of Zhalfir happens to be in their first four, I just wasted a card. I'd rather just stick in more gas.

Here's what I'm running currently:

[deck]
Lands
1 Ghost Quarter
17 Plains
3 Windbrisk Heights

Creatures
3 Martyr of Sands
3 Ranger of Eos
4 Serra Ascendant
4 Soul Warden
3 Soul's Attendant
3 Auriok Champion
4 Squadron Hawk
4 Ajani's Pridemate

Instants/Sorceries
4 Honor of the Pure
3 Spectral Procession
4 Path to Exile

Sideboard
3 Immortal Servitude
2 Leyline of Sanctity
2 Rest in Peace
2 Stony Silence
2 Suppression Field
2 Ethersworn Canonist
2 Sundering Growth
[/deck]

Auriok Champion is a beast mainboard. So much of the format right now is black and red removal heavy, it really helps.

Considering Chalice of Life sideboard.