Just a note, I've been grinding away lazily collecting, but not selling, the cards I get unpp'ed. When I got to the 3000 mark, the game wouldn't let me save anymore until I sold down to under 3000 (including my deck).
What's going to to happen when in order to have 6 normal and 6 upped (not including pillars/towers) of every card one will have to have over 3000 cards?
For what it's worth, I opened up the Trainer and subtracted out pillars/towers in excess of 15, leaving 2574 cards. If one figues that for every card made, one would get 6 upp'ed and 6 normal, that leaves room for 35 more new cards before hitting the 3000 plateau.
Of course I assume Zanz would allow for more room on people's libraries for the additional cards, so I don't think of this as being a major issue. More food for thought than anything else.