so how is the winner and loser between 2 cards decided?

@Enryu ?

As i said in the guide each card have an attack value that can be increased using barrels or influenced by cards abilities
(Green icon attack red icon damage (the damage u deal to the enemy is your card wins the round) white your card's ability)
The card with the greatest attack wins the round :)
If they won't be ready later i'll make their decks just for this once since this is just a beta test and i'm more interested in people's response and see if there are some "serious" bugs if everything is ok i'll leave everything to whoever wants to organize tournaments etc :)