It's a different approach for Sky City, I hate the aggro builds for a variety of reasons. This works faster than the aggro builds despite the slightly longer setup time. Auras spawnkill trash mobs, archers take down some of the copters before they can drop the orgres. No stuck enemies on the vents, no waiting for the last couple wyverns to get in aura range, you won't get stuck under wyverns while you jump on ship. Despite how it looks it doesn't require much upgrading other than buffs+auras. And the main reason why I like it: you can run around during combat wherever you like :)
Tested and works with 2.5k stats.
Unless i specified below, buff size doesn't matter. Build auras + buffs in the initial build phase, all minions 2nd build phase. Drop mana next to forge during 1st combat to have enough for it.
#1: Ship's electric discharge takes down the auras if they built too close to the edge. Place them between he zeppelin's support beams.
#2: 4DU buff, start at the very edge of the of the map. If you space out minions on a longer buff enemies will attack them from inside the spawn protected area.
#3: Buff starts under the arch and it's angled ~45 degrees so the minions can fire at djinns spawning next to them.
#4: 6DU buff, aura stack is at the tree