Your first set of runes will start out at 200, but from then on you'll only be able to renew to 100 charges. The fact that Dracos only get 1 attack spell until level 20 (and then the other has some ungodly delay until 25) is probably their biggest hindrance, but I think a lot of Dragon and Secian players are sympathetic enough to understand when you need to be run back for a renew.

Courtney