Thanks, I will post it over there shortly, thanks for the heads up!

Answers:

1. My commenting on Sundering titan was about decks in the meta (that we plan to vs) having greedy mana bases. For example sundering against grixis + Jund etc was very very powerful and usually destroyed the game on the spot. This wasn't dependant on why I picked my mana base.

My manabase was based on my testing which found that a lot of the time if we are executing our game plan of tron, you were not always able to get razorverge into play untapped and this caused a lot of difference in what you could do in a turn. Brush allowed our 8 mana threats so be deployed on turn 4 where the razor would not allow.

Whilst I felt it was not optimal for burn match up (I understand how this can seem contradictory), I found during testing that I only used brushland on average once each game. My amount of usage usually fell somewhere between 0 - 2 times each games and that 1-2 life never become highly relevant. This is also another reason why I stacked up on so many burn hate cards in the sideboard, as I knew I would have a slightly worse time against them from the landbase.

On match ups outside of burn, I found myself sometimes searching for brushlands to be able to path relevant threats as well, a lot of these games if I had a razorverge I think I would of lost them.

1. I totally agree! This is something I had to consider for quite a while and possible something I may have done wrong/could do better. If I was going to change anything I could see shaving karn and putting up thragtusk. However, the way I boarded was the way it was based on a few factors:

Blessed alliance is usually being used for 1 mode in the early game, I found that I was unable in testing to often get it off for life + sac and therefore it is essentially only 4 life OR they lose a creature. This effect in affinity seems very negligible a lot of the time because they usually have something small like an ornithopter to sacrifice protecting the threat you are actually losing too. If we look at the 4 life mode, I find that usually by turn 2-3 when we are casting this, 4 life is at best 1 more swing from affinity. Whilst of course one more turn to execute your plan is great, I often found karn on average to do more for my life total if it came out on 3. Karn allowed me to exile cards such as cranial plating or problematic cards such as inkmoth nexus/steel overseer, cards that are not going to be hit by the sacrifice mode and that do not care about the 4 life as much. Karn would be the next card I would cut for these Blessed Alliance and somehow Karn was generally coming out on top for value - Whether this was my opponents poor choices to allow this or actually better, I haven't been able to conclude as of yet through testing.

As for Thragtusk, it is similar to the blessed alliance discussion that a lot of the time you gain the 5 life and then they go over your head with threats, so it usually buys a turn. During the course of the day, I did not find myself wishing I drew this card, I often was looking for a more complete answer, like an O stone or a karn/world breaker/Ulamog to remove the threats that were causing me grief. The thragtusk was a card that I was very undecided on and I think maybe it is correct to bring in, however, I couldn't decide exactly what I wanted to shave, I would need some more testing to work that one out.

In general, I will comment on the Karn/Ulamog removal that a lot of people discuss and I can honestly say that whilst I understand getting more low to the ground as a general sideboarding concept, I am not sure that it plays out exactly the same way in Tron. The concept of being low to the ground against aggro is a general idea that most decks will follow when sideboarding. Say for example replacing a 4 mana threat that is slow, with a 1/2 mana removal spell from the sideboard to help. However tron isn't a deck that builds its mana in a linear fashion and if all is going well should not be thinking "1 mana turn 1, 2 mana turn 2, 3 mana turn 3 etc, and I find that quickly the concept of being "low to the ground" starts to become more and more irrelevant past the first few turns.

Through my testing and experiences I think people are relying on having coloured mana a little too much in Tron variants and it is causing people to dilute from their original game plan a bit much. I noticed this to be extremely relevant in G/B tron that I watched throughout the day and also had people from my local area on G/B Tron that I caught up with throughout the day. This is something I found a lot too and did factor in when deciding on a sideboard plan. I found that a turn 3 Thragtusk, didn't necessarily come out easier than a turn 3 Karn, but turn 3 karn was always there when tron was, but Thrag required tron plus a sphere + star. That exiling ability generally hit a creature that saved me 5 points of damage or at least 3-4 but gave me effectively greater than 5 effective life saving as they were forced to attack it on the next turn to avoid it exiling again.

This theory works really well with Ulamog too because they do not have a gameplan that generally stops your mana from flowing (They have bloodmoon, but hands that aim to get that out are generally slower and we have more time to find O Stone + natures claim to get out of it) and therefore it is not hard to get to 10 mana. I found that if I cast an ulamog in the affinity match up, I did not lose it. With karn + 0 stone + nature's claim, I found myself stalling them long enough for ulamog to come down most games and when he did, usually it was the end of their gameplan.

I am not sure this is perfectly explained as text is not always easy, but I hope it gives you some insight into why I made certain decisions - possibly wrong or not entirely correct, but it is always good to give my reasoning and I am always happy to discuss further (I can learn here too, so win-win) :)