User blog comment:Supafrunk/Concept - Solvo, the Aspect of Creation/@comment-4434378-20120213001746

So do you keep the previous charges like Invoker? That seems like it would be the simplest/nicest solution. That a way you aren't force to spend mana on spells you don't need just to cast your ult. And I like the idea you have for the mix, as a sort of panic button. However, this way does have the disadvantage of forcing the player to cast the same spell 3 times in a row to make sure they get the right ult. Whereas Invoker can store up the most useful ult.