Add yasuos kit and its the ultimate cancer
I think about this often myself.
My thoughts are to keep it... simple.
Something so simple, yet absolutely demonic...
Like, say, giving his W a cleanse effect, as well as giving his shrooms a sleep effect, And perhaps... Giving his Q an additional short-sighted effect. Oh and a stacking slow effect on his E, for flavor.
Make his blinding Dart apply poison.
Have the mushrooms be able to be remotely detonated.
Buff Nashor's Tooth.
Okay, I'm having too much fun for this.
Make his R shroom damage stack on multiple shrooms. Laughing Maniacally