Simple. Defeat another who has joined this challenge in a Best-Of-3 match, then post results here. Before battling, you must sign up to this. It's easy, just post saying something along the lines of "I'm in".
Requirements: The only Marks allowed are Fire, Water, Air and Earth (hence the name). At least 3/4 of the deck must be the same as the Mark. For the first round, no upgraded cards.
Basic. Simple. But not easy. Definitely not easy.
Players:
