When players would acquire a fifth copy of a particular rare or mythic rare card, the system will replace it with a rare or mythic rare card you have less than four copies of in your collection or gems depending on the circumstance: Booster Packs (from the Store, Mastery System, etc.): If you open a rare or mythic rare card that you don't have four copies of, you receive the card
That card also goes to the graveyard since you discard it, which is sometimes a slick combo play with the reanimation targets like Malboro
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The more you play your deck, the more youll realise that some cards just arent doing anything and should probably be replaced
Hopefully you secretly picked the right player with Guardian Archon because Nils is definitely worth protecting
Another option is Ancient Gold Dragon if you have Dragon Tempest, or Scourge of Valkas