more charging spells

This is a suggestion for perhaps future champions. There are few mechanics that involve charging/channeling a spell. Sort of like the battle cruiser's yamato cannon in starcraft or like nintendo's metroid. essentially hold it like VI punch and it does more damage on release the longer you charge it. Could either be a spell that can get interrupted and does no damage /canceled entirely {like karthus ult} or spells that when interrupted/released early fires off and does less damage. (like nunu ult) except on regular spells perhaps instead of ult. if canceled could be placed on a shorter cooldown

this could also be for defensive uses. in a way grey health sort of utilizes this. or found on new items perhaps.