This is what I'm doing, and it works quite well. It's heavily dependent on how you lay your stats out. Remember that you're going to want to pump at least about 80-85 points into piety by the time you're rank 50 and you'll be able to stick a lot of debuffs. On top of that you have Siphon MP II, Siphon TP, and Sac III. Also you can buy Transcendence to raise your affinity with Thaumaturge abilities on your MRD which will help you stick your enfeebs more frequently, and make your cure's and siphons more potent as well. Also, remember regardless of class Siphon MP works best on a mob after it's dead and the body is still laying there.