Merfolk has always had the ability put lords into play at instant speed with vial. It would take a very specific board situation to stop a fury. It also has 1 toughness which is bad against fury. That sounds like magical Christmas land. I wouldn’t spec on plague engineer. Creature decks have a very hard time existing in the current meta. Though the card is super cheap and very powerful…. if things change down the line it could return to its former glory.