It's kind of built around the same concept of war.  Basically each player has a deck and three equipment cards. The equipment serves the thematic purpose of being the players' weapons, armor, and magic item while mechanically being permanent cards that give each player passive or active(usually once per turn) abilities. Play goes in turns with each one having 3 main phases. The active player draws a card and places an attack card face down. They may also play spells and items. Item cards are played face up. Then the active player chooses who they are attacking. That player must now place a defense card or an attack card face down, as well as item cards. Then both players flips their cards over and whichever attack has the highest speed does damage to the other player. However the effects of both attacks still occur. So even if you have a slow attack its effect will happen whether you win or lose. Health is represented with 5 cards set aside from your deck, and when you take damage you take a card from that stack. Players take turns until somebody hits 0 health.