Originally Posted by The Teej
do you get 2, one right after the other, on purpose though? by design? really?
I'll assume you're talking about "double carding"? Where when you get a gold card you'll end up throwing a second as well? If so then from what I understand, no. It is currently a bug that if you don't move after you throw the first card and Twisted Fate auto-attacks right after he'll throw a second gold card.
As for Saving the gold card, like Mjollnir said this is an intended feature and it does have a timer on how long you can hold it if I remember correctly.