Wow, I didn't know you could still do it with a spellcaster
It's a bit scummy though, and if you also happen to run into a crystall ball it fits right into that rotation.
The usual way is Orc Rogue + TT + Fabulous Treasure + Damage Stacking (bear mace) + DP's/dodgestep potions. Loads of variants, and I think you can do it that way with any class with a bit of luck. No need to scumm for anything with a rogue, can probably even kill the goo if you know what you're doing, too, allthough there are runs where things go better and where they go worse.