User blog comment:Emptylord/Sandbox/Ability bank/@comment-5830369-20140107175824/@comment-3974211-20140107192816

It costs Kassadin 6600 mana to use his ultimate 10 times; or 3300 if he hits an enemy champion each time. It costs Kog'Maw 2200 mana to use his ultimate 10 times. The thing to realize is that the Arcane Mage has percentile mana regeneration - so he has the ability to churn out a lot of mana and then regenerate it all relatively quickly. His pacing is suppose to feel more like energy than mana. And the ability is suppose to feel like an auto-attack substitute, like Lay Waste and Noxious Blast.