Hey, I was your r9 opponent! first of all congrats on the finish! Secondly how confident are you that cutting Ulamog is correct in the mirror? I feel that a lot of games revolve around being the last one to cast it, and in a build like yours with 2 shrines it seems hard to justify trimming one over the 4th harnessed lightning or a censor. I'm a big fan in general of cutting censor on the play in the mirror as you often want to jam a tracker or rogue refiner, leaving you without the opportunity to cast it on their t3 play. This could potentially free up more spots for tracker. Either way the sideboarding definitely is interesting, there's a lot to think about. Was a pleasure playing you and I enjoyed the article!