User blog comment:Shaw Fujikawa/Custom Champion Revisit - Arvice, the Wandering Psychic/@comment-5638912-20121123021558/@comment-5266525-20121124195506

Is that a bad thing?

And even then, that's only if you use them one at a time. If you use all three at once then you will outpace your regeneration quite considerably. And if you have your ultimate toggled on, you are definitely going to run out quickly if you can't hit someone suitably healthy to restore your own mana.

The idea was that they still had the same costs, but I should probably make it similar to your suggestion and make them free for the duration. Between the natural loss of mana, his spell costs and the fact that every enemy can effectively inflict mana burn on him, he's practically going to be totally dry in a teamfight if he turns it on.