New Game Mode: LCS (No, not that LCS)
The LCS game mode that I suggest to you now stands for Last Champion Standing. I envision a free-for-all way to play League, using the already available Crystal Scar map. Set each capture point as a spawn point for each champion, and give them a stock of lives. When a champion dies, they respawn at their location until their last life, at which point if they die they are eliminated. Play until only one champion remains. This Last Champion Standing shall receive all glory and bragging rights beholden to a victor.
healing enemies to entice them to attack others. Diplomacy will be the name of the game in this mode, and betrayals won't be far either.