Upper + TB + 2x Hunt Summ + Builder Warden during waves. Swap upper for builder Guardian. You can use wrath on Warden if you want, but it isn't needed.
Upper Shoots at hint 2, making sure to land projectiles in spawn. TB stands at 3, shooting at 4.
Make sure the Pylon hits the tower stack AND the east auras.
This build is, funny enough, faster than Survival AND is more AFK, not requiring Wheeling or resetting TB for the same times.
Since this is Pure Strat, you require more stats to run it. I probably wouldn't touch this build before 6-7k main stat.