Awesome but probably batshit insane gamemode; GLOBAL EVERYTHING
Global EVERYTHING, all abilities, autos, spells, etc all work at a global range. Heatseeking Annie Qs from across the map, Ashe W carpetbombing, Irelia dashing from top to bot lane, Evelynn Q slowly surging through the map. Ezreal is everywhere. This is the craziest idea I've had in a while. EDIT: Okay, maybe not autos.
goes back to base and buys a few items. Then sees his tower under attack...
starts game with E, moment the wall is down, he presses E, "Pentakill"
Um... yeah..........
Takes turrets from spawn...
Global hecacopter.
NOM NOM NOM!!!
Becomes Spirit Breaker from DotA?