Sounds like clan wars with random people.
Personally I rather see Duel Tournament be removed from the game since it is not that active at all, while you would remove it you could keep the knife/dagger icons and use those for the rebirth system (1x rebirth = 2 dagger icon, 2x rebirth = 3 dagger icon)
http://i47.tinypic.com/143l2eq.jpg
1x rebirth = 2 blue daggers
2x rebirth = 3 blue daggers
5x rebirth = 5 blue daggers
10x rebirth = 1 golden dagger
15x rebirth = 2 golden daggers
20x rebirth = 3 golden daggers
25x rebirth = 5 golden daggers
50x rebirth = 2 swords + 1 flame
100x rebirth = 2 swords + multiple flames