
Whenever another Klingon or Warrior you control diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., Curzon Dax deals 1 damage to each opponent.
When Curzon Dax diesdiesA creature dies when it goes from the battlefield to a graveyard. Being exiled or returned to hand is not dying., you may put a creature card with mana valuemana valueThe total amount of mana in a card's cost, ignoring colour. A card costing has mana value 4. X counts as 0 except on the stack. 3 or less from your hand onto the battlefield.
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Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.