Champion Idea: Charged Health-Based Abilities

We've seen charged abilities, and we've seen HP costs for skills. Why not create a hybrid? A champion with charged abilities that can be charged, and cost more health the longer the charge. I'm thinking of a tanky, top-lane fighter. Some kind of knight with a huge claymore-style sword. I've got most of the moveset, but not really a full concept for the champion itself. Passive: Each enemy ability that hits reduces cooldowns on abilities. Q: A circular strike with expanding range and growing damage as it is charged, but costs more health as it is charged. W: A chargable dash that gains distance when charged but costs more health. E: Passive defensive stats, when activated heals based on surrounding enemies. R: A series of strikes, damaging the target and following regardless of movement. Let me know if you guys have any other ideas for the moveset or anything to build up the champion concept. Thanks for reading and have a nice day.