Deromateria

A quick, fully self-contained card battler game.
The game comes with 20 "Thing Cards", which are drafted out to each player until each player has 10. Each has an attack and defense stat, as well as an effect.
The players then shuffle their decks and set their life to 20.
On their turn, up to 3 cards on their 3 spaces. Then, choose opponent spaces to attack. If the opposing center space is empty, their life is directly attacked. First to reduce the opponent's life to 0 wins.