I run a solder deck that is quite similar aside from the lifegain aspect. Looks good. Couple thought tho:

Cavalry Pegasus Seem unnecessary. As you have Odric for evasion.Soul's Attendant + Soul Warden + Darien, King of Kjeldor = take dmg, gain more life, create tokens.

Tokens would be a great way to help more with gaining life since I already run Soul Warden in this deck. I'm interested in replacing Cavalry Pegasus with Soul's Attendant . Aside from Darien, King of Kjeldor what else could those cards work well with?

They work really well with anything that generate tokens. Increasing Devotion , Elspeth, Sun's Champion , Captain of the Watch .

Also take a look at Suture Priest

i like it!! Something that helps me get big creatures out in my Gisela boros EDH deck is Quicksilver Amulet Just a thought. :)+1

Quicksilver Amulet is pretty incredible. I haven't been struggling too much with getting big creatures out, but it's a good option.