In a solitaire game:
1) Most cards before Turn 2
2) Most cards in an opening
3) Most unique cards in deck after opening
4) Fewest cards after opening
I'm guessing the answer to 1) is
Stonemason/Death Cart*2/4*Ruins
I think 2) Would be
Stonemason/Nomad Camp*2, then Stonemason/Death Cart*2/4*Ruins, then buying another 2 coppers
Not sure about 3)
4) Best answer so far is $6 doctor, trashing 3 estates, then mint, leaving you with a 4 card deck