No soul songs but here are a couple of (early) reggae ones (incl ska, rocksteady) for inspiration:
Derrick Morgan - No dice
Hortense & Alton - Don’t gamble with love (ballad)
King Cry Cry (Prince Far I) - Deck of cards
King CC - Rasta poker
Jimmy Cliff - One eyed jacks
Young Freddie (McGregor) - Drink and gamble
Nat Cole - Pack of cards
Lynn Taitt & the Jets - El Casino Royale
Shenley Duffus - A Bet cha don’t know
Basil Gabbidon - I bet you don’t know
Don Dummond - Lucky seven
The Techniques - Love is a gamble
King Edwards - Russian roulette
The Pioneers - Jackpot
The Maytals - Domino
Sound Dimension - Straight flush
Don Drummond - Ruyal flush
The Kilowatts - Slot machine
Candy - Ace of hearts
Owen Gray - Tumblin’ dice
And some interesting labels of course: Dice, Jackpot, Spade Records, …