How can you be so out of touch with the community? Mana problem has never been related to Radiance. What need to be checked is the mana cost of Mind Blast, Renew, the mana generation of Shadowiend/mindbender since these spell all account for too little in relation to their mana cost.
Also, one week from launch day and still Void Summoner is locked behind Mindbender. How can you miss this design flaw?