What if there was a champion who killed you with parasites/diseases?

Like this champion could inflict you with diseases to weaken you and inflict himself or allies for buffs?

Heres my idea on how his kit could work.

Passive: Inflicted: All of this guys autos to large monsters or champions get inflicted with a parasite that does nothing to them except when he uses abilities, charge system on parasites he has. Parasites dissapear after 7 seconds. Parasites stay if he keeps autoing the enemy, max 1 parasite per enemy. He can put the parasite on an ally champion. Lasts for 30 seconds on allies, infinite forself.

Q: telepathically tells the parasite to change a portion of the enemy cells into cancer type cells, damaging the enemy over 5 seconds based on enemy max heal. If used on ally or self, has parasite sacrifice itself for the ally body to heal itself.

W: Sacrifices a parasite in charge system for movespeed that decays over 3 seconds.

E: All parasites on allies or enemies die on activation. Enemies get their bodys processes messed up causing them to have lowered resistance and no health regen(not heals) for 1.5 seconds. Allies have their processes sped up causing them to have a moment of adrenaline giving them 20% increased damage and slightly higher resistance for 1.5 seconds. Allies lose 20% movespeed for 1 second after the effect wears off.

R: select enemy champion or ally with a parasite. Enemy: parasite burrows into the enemy's brain where it then reduces target vision range to 200, blinds them, the reverses movement control for 3 seconds.

Ally: Increases vision range by 700 and gives true sight equal to vision range for themselves and to allies if they hit something invisible. Parasite multiplies inside them after 1 second upon activation causing ally autos to apply parasites to the enemy for 3 seconds. Vision buff lasts 6 seconds, parasite autos last 3.

I got told to make a champion who gives people cancer so I made this support type champ. Thoughts?