Holy Crap! - S2-E23
Corrected entry: During the game of cards when Kitty brings the youth minister to the house, Laurie, assuming to get the minister's attention, plays three "6" cards spelling out the number of the beast, "666". Although the suits are hard to discern, all three of the cards she played are black which would be impossible in a regular deck of cards.
Correction: First two cards are definitely red and the last is black. But, regardless, I believe they're playing rummy, which often uses multiple decks (though only one is visible on the table). Either way, it looks like heart (red), diamond (red), club (black).