That is corrrect. The base cards never leave and will be in your packs the vast majority of the time.
It is best to only think of packs only for items to be used in sets. You'll get the occasional winner, just like in Vegas, but you shouldn't plan on it.
https://www.youtube.com/watch?v=y6eCwE8oCIE
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It is best to only think of packs only for items to be used in sets. You'll get the occasional winner, just like in Vegas, but you shouldn't plan on it.