Amilli, Cloudmarshal is in my oppinion along with Marshal Ironthorn one of the two best mono justice legendaries we have. Shard of the Spire makes him even better...he was amazing as a 4/8 before, but an 8/8 flyer with massive upside on turn 5 is nothing short of ridiculous.
If you're interested in things like: Why I made a cardchoice, Mulligan decissions, overall or particular strategies and so on, feel free to post your questions in the comments, I'll try to answer them to the best of my abilities.
(P.S.: Oh and if you like the deck, an upvote would be much appreciated.)
I can see what you're saying about the Augmented Form, but without some sort of evasion (unblockable, overwhelm, etc. - something other than just flying) or at least a few more naturally occurring Aegis units, it's not as powerful of an effect, because it doesn't just end games (which your 6-drops should be doing, regularly). I just never got AF's function outside of a deck with heavy Overwhelm effects.
also commando doesnt have enough friends in this list. id suggest desert marshal/valk enforcer for some nice extra silence
spiritblade stalker is very sub par card. if you are looking for cool units for spire why not the 0/7 justice unit
Same goes for Spiritblade, when it gives Lifesteal, which with Commandos buff gives even more life.
I included both of them cause I kept dying to rush decks while I was building up, and also burn and Channel the Tempest made my life hard.
What I like about Spiritblade is, that I can use the Ultimate on itself turn 5, if I have no other options and need a 3/5 Lifestealer. with Spire out, that gets of course much better and turning Amilli into a 9 Atk Lifestealer feels great.
I don't play the 0/7 cause it's basicly just a big dummy, even with Spire, and sure, sometimes a big dummy is just what you need, but that's why I play 4 Dune Phantoms, which are only -1 stats, but fly and are flexible to play.