Can please someone explain to me how the “banned cards from duels” system works? Why banned cards like wildfire can be offered and also can be discovered and a card like ice block or sister svalna are nowhere to be found? This complaint is more for Reno-wildfire decks which is ridiculous !
Banned cards are simply banned during the deck building process. Finding them in card buckets is different. Not sure about Ice Block specifically, but I know Svalna should be able to be discovered so I think you just got unlucky, assuming you had cards from the same expansion she was in.