Similar to Magic: the Gathering, this game requires you to think quickly about which of your cards will help you defeat your opponent more quickly. At the bottom left part of the screen, you will see the five cards that are currently in your hand. Clicking on a card will expand it, and you can look at what it does and what its mana cost is. You can discard a card on your turn or you can push "Play card". Each time you play a card, a new card will take its place. When you have creature cards, they will be able to attack your opponent's creatures.