Add a Mana Restore onto Ryze's Ultimate but...
Give all of his Mana costs (QWE) a +% of Max Mana addition
So it would read like 60 + (% of Max Mana) Mana cost for his Q, just as an example
The idea behind this being, Ryze is a single target nuking tank mage and once he builds even the slightest amount of mana he never runs out. Well now he can actually run out unless he uses his Ultimate skillfully to get some of it back.
Thoughts?