This is a big part of the game’s strategy. To successfully summon a card, you need to fulfill some criteria:

  1. You must have enough Mana in your pool (bottom right of your screen)

  2. You must have a slot on your side of the battlefield (when summoning Units). Each battlefield can simultaneously hold 1 Hero and 6 Units.

  3. You must have a valid target (when summoning Spells).

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