EDIT: I had to re-read your comment on Jhoira and, unless I am misunderstanding what you are trying to do, it doesn't work with Jhoira to draw extra cards. Jhoira triggers on cast and the permanents you get are not Legendary until they resolve which is too late for Jhoira to see them as Legendary.
As for Smoke and War Tax (and probably Meekstone as well): I don't really know. I have gotten each one down once. Smoke did nothing, Meekstone came down too late to ever make a difference (I was already winning) and I have been banking on the potential of War Tax rather than its actual effect. It is rare where I want to keep up mana for it which means that if I do have mana, the rest of the deck isn't working well. The one game I had it in I was able to activate it because I didn't have anything else. And it is tough to actually protect Walkers since it has to be activated every turn. I have gotten close to cutting both Smoke and War Tax because I didn't need them in the games I won and they wouldn't have helped in the games I lost.
Your experience with them may differ of course, but I am starting to believe they are not worth the slots.
Quote from toctheyounger77 »Thanks for this feedback. War Tax feels like it'd be a little easier to replace with a simple Propaganda, really. Smoke I like in theory, but end of the day it still means that creatures get at least one chance to swing at you before they get locked down. I'm not sure if there's really anything better than it than just running more removal.
I am not sold on Obliterator mostly because of the mana cost. Even yesterday I am not sure when I got to 4 black sources but it was not early on. I get the idea of making opponents make a difficult choice, and it does seem pretty good on paper and if you do try it out, I would like to hear what your experiences are with it. But, I am not too sure on whether the restrictive mana cost can be easily overcome for it to really do much.
Ugin, on the other hand, seems pretty good. I don't run as many rocks as you do, but it can be relevant. The token and card from the token seem really good too. The ability to destroy a permanent is also really good. As I said above, I don't like Sorin so I might just try to do a straight swap.