New champ idea (shielding tank)

I have always wanted a tanky champ who is based around taking damage and shielding so here is my design idea.

Passive – Each time you take damage your cooldowns are lowered by x seconds (very small amount) and you deal x% (+x% per x ap) max hp in damage to all enemies around you as magic damage

Q – Emit a pulse from your body that does x (+x% ap) damage to all enemies and slows by x%. Enemies at melee range are not slowed and take 100% damage; enemies at long range take 0% damage and are slowed by full amount.

W – Records all damage taken in battle for x seconds (similar to Ekko’s ult).
If cast on an enemy it does x + stored damage% (+x% per ap) magic damage If cast on self or an ally it heals for x + stored damage% (+x% per ap)

E – Reflects all effects of next attack from a champion to hit you for the next x seconds (skill shots are reflected 180 degrees back to where the ability was cast from, does not affect ground targeted aoe’s like morgana’s w or pet attacks)

R – If targeting an enemy, x% (+x% per ap) of damage dealt to you is instead dealt to the enemy as magic damage If targeting ally, x% (+x% per ap) of damage dealt to that ally is instead dealt to you Damage is calculated before reductions so target takes x% of total damage and you take z% of total damage and then it is reduced by each person’s defenses While R is shielding an ally, E affects both you and your ally