FFA King of the Hill
Image this. A round map, 6 to 10 players, one hill, no kill limit, time is based on a vote in champ select from around 10-20 minutes, all players can ban 2 champs, anyone can leave at any time but forfeits all IP they would have received at the end of the match. Each player has their own spawn platform that changes location each death, shop is available anywhere on the map. No minions, no towers. Winner earns extra IP. And most importantly, no complaining about teammates.