Degen in the mystic class and Mojo-proofing the game
Had a feeling this was coming eventually. Mojo has seen a huge uptick In value the last 12 months in alliance war because of how versatile he is. His main source of damage is degeneration, it's passive, and very few champions are immune or resistant to it. He's not as powerful as Kate but he has a similar advantage.
This is pure conspiracy theory but I think the recent addition of degen to mystic is less about class consistency (although that's 100% a thing in the game) and more about setting up the stage to control Mojo better down the road.
The Magik buff gave her degen. Same with Ghost Rider. Dracula, Maddie, and stellar forged Blade came with it and are all relatively recent.
And now Wave's sig ability passively heals up to 70% of damage taken from degen.
The shift is coming. RIP Mojo : (