This solution does not require much skill, so unless if you do not mind wasting 10 minutes of your time doing the EXACT same thing, don't do it.
-At least 1 minion (Stardust Dragon) (Destroy Stardust Pillar before last pillar) -A weapon that can pierce through walls (Solar Eruption) (Destroy Solar Pillar before last pillar) -2 Teleporters connected while placed far away from each other. -A nurse at 1 teleporter for healing. -Roof above teleporters for protection against projectiles. -Some time depending on attack damage dealt by weapon and minion. -Staff of the Frozen Hydra (optional)