Friendly Fire: Enabled (Game mode concept)

We have all seen games that people seem to just cast everything all willy nilly. Which is fine in of itself, but what if it was dangerous? That is the idea behind this game mode.

Attack Minions: You can last hit your own minions to deny farm to the enemy. "But Pandaa that may give aoe using champs a huge advantage for denying enemy gold". Right you are random voice in my head! Which is why i would also throw in one of the following; Enemy gets half gold from the minion, Player loses half the worth of the minion (think of it like life insurance to pay for the grieving minion family.) Or a mix of the two.

Executing your team mates: You can kill your own team! "Pandaa! No, bad! Go to your corner. That will lead to heavy trolling." Which is why I factored two things to combat this. One, you lose the gold for the kill, starts lower and gets higher. So the first one might only lose you 200 gold. The next would be 300, and it would keep building. There is a debt mechanic thanks to one of the runes, so you can go into the negatives. Which prevents you from building more damage. Leading to second factor. Team damage prevention over time. As the game progresses; unless you are building damage your damage to friendies drops until nearly nil. As well as your ability to cc them. Which is great for support building champs/players, but bad for trolls.

Destroy towers: eh.... Probably only be able to attack them if below a certain health threshhold. I mean, could be a fun thing to race opponents with. Who can destroy their own nexus first? xD

Nexus: Probably untargetable.

I don't expect this to get popularity, was just some random idea that sounded fun/interesting in my head.

Edit: Positive effect abilities retain their positive effects instead of damage. Lulu doesn't suddenly change allies into cupcakes and Ez's W still gives whatever it does. Abilities still prioritize enemies over friendlies. So a Yi Q will hit all available enemy targets before potentially hitting a friendly.