Didn't see a second post about this other than it isn't a traditional deck builder but I am just confirming to be sure.
Not sure if I am being of help, but...
This is not a deckbuilder meaning that you have to build your deck before playing (some call that "deck construction" to avoid ambiguity with the other
kind of "deckbuilding").
It has the "deckbuilding" unfortunately-named-so-mechanic that is found in a number of other games, of which I think the most known/popular is Dominion
. You alter your deck during the game, as an outcome of your actions in the game (this is "deck management").
So BBTM has deck management; you do not build your deck before playing, and, as others have stated, you do not need multiple copies.
However keep in mind that "deck management" is present (it is how you acquire new players for your team) and an important aspect, but not the focus of the game, as it is in Dominion; it does not work that way.