Gold Whizbang and Zayle generate fully golden decks, which is probably what you faced. Zayle is free when you unlock the Dalaran Heist’s final wing (3500 gold total), Whizbang can be crafted for the same price as any other legendary
I know that you are probably right and I wasn’t facing someone who did buy/craft an entire deck of golden cards…it was more amusing to bring up “How do we kill that which has no life?”…and there have been posts by individuals who want to craft gold decks because they don’t have anything better to do in the game…