Tore:
The card, as Pynchon reminds us in GR, has
"no agreed assignment in the deck" (GR, 724) -
so perhaps it is, in
some sense, a wild card?
You nailed it,
Joker numero "0".
The scene itself must be read as a card: what is to come.
(GR, same page as above, 738 in my copy)