Players need mana to deploy cards on the arena. The mana amount required for each card is written on its top left corner. Cards with higher mana costs are stronger and have a greater effect.

Crystals generate mana over time. Each player starts the battle with 2 crystals. Every time you draw a card you earn a new crystal, up to a maximum of 12.

The “Extra Crystal” card will give the player an extra crystal right away, allowing the player to put higher-costing cards before the opponent.

If the “Extra Crystal” card is used when the player already has 12 crystals, the player will draw a card instead of receiving a crystal.