A permanent stacking buff for teams who assist often. (concept)
Every time you assist an ally with a kill your allegiance to that ally increases. You have +2 AD and +1 AP for every stack of allegiance you share with a nearby ally.
This means that late game a 5 man team will have quite a bit more power if they were playing more cooperatively as a team.
To counter the encouraged "party bus" there would be a 2% increase in gold and exp gained when an enemy is killed alone.
This should help Top lane gain more power while encouraging teams function together.
LOL now that I have made it to the end of this post I realized I don't actually like it that much. but rather than delete it Ill see what everyone else thinks...