This is based off of Washboard's CR3 survival build. I tweaked it to help me complete it more regularly because I suck at emulator wheeling. If you want the basic idea of the build, go watch his video https://www.youtube.com/watch?v=LDWGxUJaQ7o&t=396s
Hint 1 - Aim two DST's at each of the other crystals.
Hint 2 - Have two alt jesters here by the lightning towers, one with a Monk guardian, and one with a Huntress guardian
Hint 3 - Stand here with your Tower Booster and 3rd Jester alt (upgrader)
Upgrade all of the buff beams except the one with DST/LTs to 3 stars before the start. Use Jester move tower to place the gas traps as close to the crystal as you can. Wheel 3 swords off cooldown, with a heal all thrown in every once in a while and upgrade while you wheel.