I use a ranged DPS (jester) and 3 huntresses with guardian pets for boss.
Blue arrows are cloud directions.
Build Phase - Buff beams, auras, Pylon, and all of pin 2.
Combat phase - Use a TB monk to drop mana on pin 1 for warden builder. (It's fine if a core gets hit while setting up, clouds will take care of it.)
Then swap warden for upgrader.
After upgrading just use a TB monk on his own for fast waves up until wave 12 then swap him out and add splits to whatever hero you want the weapon for. (Guardian pets help.)
The East wall starts ontop of the pumpkin that has the letter E on it and drags to the ground so santa cant jump over it. (During the boss that spawns there you may need to repair walls until that boss is dead.)
It's possible to get the downstairs bosses to jump off the edge at pin 3 if you lead them.