Why does mundo's ult cost 20% hp at level 6?
It should be free at level 6, then 10% at level 12, then 20% at level 3 OR just be free with the huge healing debuff from items, there's now a perma-debuff heal so he's 40% gimped from healing as well. He's in the top 5 least-played champs, might as well make his ult free or make his lower levels free. It doesn't make him stronger, it just makes him live.