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Deckbuilding effects are effects that take place during deck creation. While a card with a deckbuilding effect is included in a deck, the rules for how that deck is built will be altered.

Also see Allied, a Duels-exclusive deckbuilding effect Ability.


  • Unlike Start of Game effects, the deckbuilding effect triggers before the game begins and the opponent is not shown the effect taking place.
  • Although similar, The WitchwoodGenn Greymane and The WitchwoodBaku the Mooneater are not deckbuilding effects since they can be included in decks with odd/even cards, although the collection manager will automatically filter to show only appropriate cards while building a deck with them.



Swipe left or right to see the cards.
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Swipe left or right to see the cards.
DAL 800.png
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Patch notes[]