@Champ Design Team: Why do some passives scale at levels 1/7/13?
I'm making a champion concept, and it includes a passive that I don't want abused in the early game, so I stuck it onto the ultimate (so that it scales at levels 6/11/16, just like Ryze.) After browsing the wiki, I found that some passives (like Karma's) scale at levels 1/7/13 instead.
Why do some passives scale at levels 1/7/13 while others scale at levels 6/11/16?