For creatures, I would suggest having Soul Warden and Whitemane Lion since you are invested heavily in having creatures enter the battle field multiple times.

Yottsu, thanks man. I alreay considered putting in the sisters, but their impact is miniscule. They dont impact the board until the pieces are set up, and by that time, i am usually winning anyway. Whitemane lion is ok, but isnt crucial. There is alot of creature trading during combat, which, believe it or not, is beneficial to me in the late game, so returning something to the hand isnt really where i want to go. I would much rather have 2 creatures die in combat for me to return mine at a later time. Thanks for the upvote and feedback though!

Interesting list! I think yours is a bit more control than mine (UW Resurrection) and thus wants Spancasters more than mine does, but you have an interesting idea to replace some of the Emerias with Celestial Colonnade. Just seems like a bit of a split strategy with Sun Titans not really getting much out of the graveyard with all of the instants you play.

I've got a similar deck but run Reflector Mages, Aether Spellbombs, Flickerwisps, and Venser, the Sojourner. Sun Titan is a lot of fun :) +1