Update with Dominaria, you can replace the automaton with with Benalish Marshal. Not colorless but it will pump all your creatures. You're basically mono white land base anyways so it fits in really nicely.

Have you considred Metallic Mimic to replace Adaptive Automanton?

UEG_Starhunter "The Adaptive Automatons and Hivestones go well together" Metallic Mimic doesn't. It only works bound to knights and loses it's power there. It's a sound suggestion though.

This is so cool. +1

I just went 3-0 with this deck in some tribal wars I've been hosting on MTGO. Much appreciate the list all in all. Found this list as fore I am also a knight guy, looking into other lists for certain spice including, in my humble opinion, the all star of white creatures occupying the two drop slot in the knight tribe being... Knight of the Holy Nimbus, ofcourse.

Love it.