@aosquirrels
How important was Karn in a build that already has an unusually large amount of robot beef for a Stax deck? With Trike, Titan, and 3 Masticores, Karn seems unnecessary. And since Tezz looks to be a pretty rough matchup for you, maybe some maindeck Pithing Needles would be in order.
I couldn't imagine a build without Karn. But then again, I couldn't imagine a Stax deck without Chalice of the Void which this build doesn't have. Go figure. In any case, I do agree that Pithing Needle is important but it can still stay in the sideboard for now. Maindecking it would be just a matter of player's choice. Karn was key in my first game against Ad Nauseum. Ate up all those 0cc perms. As far as too many beefy creatures....the number of them is ok in my view. I might change one Razormane into a second Trike if I decide to play this build again. I would also like to try Eater of Days in this build!
Carl