I was given a bunch of decks/cards that I plan to sell here at the Café. Can anyone help identify these, so I know what to call them?

1) There's a deck with many jack of diamonds dupes--15 or so--along with 3 or so indifferent cards which are narrower than the rest. Remaining cards appear to be normal.

2) Deck that's half one-way--looks like 26 or so, all 7S, the rest look normal/indifferent.

3) A packet trick, 4 red-backed bikes, one's blank, the other three are all the same (3H).

And what do you call the plastic sleeve with checkerboard pattern, that reveals or disappears a card?

1) I'm guessing it's some sort of sven one-way. Not sure.

2) That is exactly what it is. Half a one-way, half a normal deck. It's a simple way to show the deck as a normal deck.

3) My guess is that it's a simple ink printing trick; show all 4 cards are blank, then show they are all printed.

4) I think you're thinking of WOW.