If you want a few ideas for tweaks then take a look at my deck, Karn, the Spirit Dragon. I've been playing it for a while now and I can try and help you figure out some tweaks if you'd like.

Im going to wait to do any big tweaks until the next BnR. if eye gets banned, ill need to replace a few cards

why Combust in the sideboard? There's no twin anymore and nobody plays kiki jiki.

Thought-Knot Seer looks really bad here. Not powerful enough. I've tested a bit with Thought-Knot Seer and World Breaker in my version, and they were just not good enough.

Relic of Progenitus should probably be in the sideboard (unless your meta is full of storm), since there so little graveyard based decks.

I would suggest another ulamog, since that card is so good. I'm playing two of him, and i'm even considering a third.

Nice to see other tron players out here!

mtgplayer100 In the wake of the Eye of Ugin banning I have swapped out Eye of Ugin and 1x Spellskite for 2x Conduit of Ruin. I'm testing them out to see how viable of an alternative they are. What are your thoughts? Here is my deck: Karn, the Spirit Dragon.

Jack-Frost i've would rather play another ulamog instead. The thing that made eye so good, was that it could also get wurmcoil against burn. I also don't like the Rending Volleys in your sideboard. There just aren't a strong kiki jiki deck in modern, wich is the only deck where you want it. It is also good against fish, but you've already got Kozilek's Return, stone and ugin to make it a favorable matchup. Also i don't like sideboard cards in tron that only are for one matchup.

You should also consider Sundering Titan, now that control decks are going to be more popular. The titan is just in general a great card.

If you want some ideas, i've got my updated version here: Play a land, now i ramp.

i've seen people running Tooth and Nail and a 4th Wurmcoil Engine. thoughts on that?