Gambler (Labyrinth)
A Hierophant (Tomb/Grail)
Musashi (Alchemy)
Killer Prime (Warlord/Sustaining/Tranquility)
~1min per run.
Most battles won with Gambler and Heirophant... Musashi to clear that odd invincibility/perfect health buff every now and then.. KP to mop up if needed and remove gold buffs at start.