Each player would start with 2 elements.
You can use only the elements you own.
When you beat someone, you steal one of their elements. ( obligated to be one of the elements they used in the deck) So you win an element, and your opponent loses it.
I didnt think about this in a tournament format, but more in a league-like. what i mean is you can play vs anyone at anytime.
This idea is still in developpement, please comment and suggest.