Is there any other sorc-abilities that should also get stacking cost-increase? Why settle with just bolt escape and ward... Mages fury? They say sorcs just spam fury in battlegrounds for the win, not acceptable. Need stacking cost-increase. Overload? Isn`t it clearly overpowered if sorcs can spam them hard-hitting lightning-balls and maybe even kill someone, need stacking cost-increase. Rune-cage? Encase? But of course.
Or perhaps it would be easier to just add it as passive to each sorc skill-tree: "casting any ability again within 4 seconds doubles abilitys cost".
That would teach them sorcs to not just mindlessly spam skills but git gud and L2P instead.