I have a dumb idea on a champion that revolves around death

Passive: he infinitely stacks "death essence". He gains 1 death essence for a minion kill or small monster, 4 for cannon minions or large monsters, 6 for champions and dragon kills, and 10 if he kills baron. Death essence has no effect on him stats wise but once he has 10 or more, he uses 10 to create a death spirit that has 1/3 his stats, take 40% of his damage, and on death explode. He can have maximum 3 death spirits out at a time. Spirits last 30 seconds.

Q: he can only target minions or monsters(excluding dragon or baron) and after a 3 second channel, instantly kills the target. This ability would have a roughly 30 second cooldown.

W: When he activates his W, his death spirits that are out instantly come back to him healing him for whatever health they had and giving him 300% AD on his next auto attack.

E: passively his autos and his death spirits mark enemies with death runes, maximum of 4. When he has 4 runes on an enemy non champion or epic monster, his Q is instant and refreshes its cooldown instantly.

E Active: All death runes on all champions curse the enemy, having a 25% chance of cursing the enemy for each rune. Enemies that are cursed are cursed for 3 seconds making any damage they deal reflect 40% of it reflect back to them(including true damage) before resistances.

R: "Revives" one dead champion, friend or foe which is uncontrollable by anybody and serves as a death spirit. This death spirit lasts 12 seconds and when it has 3 seconds left to live, it latches onto an enemy champion before exploding for 20% of the ghouls max hp.

Broken as fuck?

Just a dumb idea i had.