Any problems with the low land count? Do you mulligan aggressively to find the 1 or 2 you need to function?

This is probably the coolest mono white deck I've ever seen. I just wanted to make sure you've noticed Crackdown Construct which is arbitrarily large alongside Mirror Entity (though everything else dies), Outrider en-Kor, Basalt Monolith, Lightning Greaves, or Umbral Mantle.

MagnetMan

The deck really only needs 2 lands and a rock to start with. 31 lands has felt a tad low, but it's still just under a third of my deck and there's a ~77% chance that I draw 2 or more in my opener, ~ 82% if you include your draw for turn. With the free mulligan, you're usually good to go. Tithe, Land Tax, Weathered Wayfarer, and Gift of Estates all ensure you'll be able to get the 2-3 lands you'll need to curve out.

Twelfth

I used to play Crackdown, but it was a bit clunky at 4 CMC and having limited tutors for it. Also, being limited to attacking only one person without evasion eventually led me to cut it.

What kind of utility has Hope of Ghirapur provided for you? Also, why do you choose to run Heap Doll over something like Tormod's Crypt? Is it because it is slightly easier to tutor for with Ranger of Eos and Recruiter of the Guard?

Driemer84

Hope has been good - it can protect me from the player most likely to have a counter, and shut off a combo player before their combo turn. Its also nice way to seal the game when you're down to 1v1 and just need one more turn to swing or combo off. Being tutorable by Recruiter and Ranger, helping for metalcraft on Fair, and being Skullclamp fodder just makes it better.

The same goes for Heap Doll. I can tutor Heap Doll easier than Crypt, and it can always be Clamp'd away. The body is also nice since I do win quite a few games with Mirror Entity swings.