I've got the perfect idea. Thought of it over breakfast.
Loyalty
A team based event, where teams pick a number of elements and/or marks that "represents" their team. E.G, team creation might have air, life, and light as their elements. Then, whenever a deck that has 50% of it's cards from those three elements wins, team creation gets points. Whenever you personally win, you also get points. Your personal score is separate from your team score.
You do not have to play a deck that follows your team.
That means that while you may be on team "creation", you may "betray" your team and take a firestall if you think it'll get you more personal points. If you win, you may be helping team destruction, (earth, darkness, death), but you also increase your own personal score.
At the end of the event, the first player to 10 or so points wins, and when a player wins, the team with the most points wins, regardless of if that player is on that team. So the question is, do you remain loyal and try to help your team win, or do you betray them and earn easy points for yourself?