Spelltwine is underwelling with only becasue you are dependent on others often you are going to grab a something just to fix land or distroy something  two things you should have in your own deck. i think you are runing a lot more creature then I would also but thats just me we have to see it being played to see how and if that matters. i dont like Honor-Worn Shaku because you need a target and i dont believe you can tap walkers. by that i mean I dont think they are legal targets. the artifact ramp is ok but i stay away from it niw because most board wipes are hitting everything now adays but again this is playstyle preference on my part. so i like mana fixing a bit more in a 5 color deck where the right kind of board wipes are a big deal. You are not playing enough insants for Wilderness Reclamation to matter much. I feel like Oath of Chandra makes you a target when you alrfeady are and 2 damage isnt worth it you can put better stuff in. you also need about 6 more lands in a 5 color deck.  The walkers are up to you with what you are going for however i do not like Sorin Markov hard to cast and not game wining  just one play crippling. and Ugin is a double edged sword if i grab it from your deck I can gain control of the game from you. It has happen enough to be that i am not a fan of putting things like that in my deck. but those are my thoughts for now