User blog comment:Emptylord/Champion reworks/Corki the Daring Bombardier/@comment-6301771-20130628174658/@comment-3974211-20130701121809

Tryndamere was converted to Rage and it only interacts with one of his abilities. Many people have been pushing for Vladimir's Empowerment Stacks to have a similar treatment. Most energy champions can't get exhausted until they use all their abilities, in fact, most can use two and never get exhausted - it's only when they use their expensive utility skill that their resource actually comes into play. In fact, most mana champions can sustain indefinitely using only their primary ability.

The point of this change was to improve Corki's viability and make him more fun. Heat basically ticked both boxes without having to change anything else about his kit, although I chose to (sue me, I like to tinker) - simply because the main reason Corki isn't fun is because of high mana costs (and for what?) and relatively bad ultimate (it's worse damage than Mystic Shot), and that bleeds into his viability: why pick someone who is out of mana after two skills when you could play Ezreal, Vayne, Quinn, Draven, etc, who all have negligible costs and as much damage.