2 guild members in the match must random their hero.
1 guild member in the match must kill a courier.
All guild members in the match must play one of the ladies.
Win, and do what it asks, or the game never happened. Every game, all week.
A shared target for the guild each week, a personal one every three days. Points, levels, a ranking.
A hidden pool of badges for the weird, the funny and the embarrassing. They pop on their own.