When its sent to the Graveyard, you can add a Shaddoll card from your Deck or Graveyard to your hand, and then discard a card so you can immediately use another Shaddoll Graveyard effect
If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Whenever you cast a spell from exile, copy it
alternates with card bonuses), completing daily quests with a reward of 500 or 750 gold, finishing Constructed events, and leveling up in the Mastery Pass tree
At first glance, Dusknoir is nothing to write home about
Compare that to a deck like Sky Striker, where your plan constantly changes because you can arrange your resources at will each turn