If those Rylai's changes go through, Morde is dumpstered
Removing the HP and adding mana/cdr would make it completely unviable on Morde. Morde is completely reliant on Rylai's at the moment just to function at all. Now you're going to remove the HP he needs to survive as a completely immobile melee champ and add mana that is literally a wasted stat on him. This makes it completely cost ineffective on him.
So how does Morde function now? I understand something needs to be done about Rylai's being abused on certain champs, but if these changes go through you absolutely must do something with Morde. He's going to need a mini rework at least.

i used to build
made it so nobody can build it but him...