Theme: It's in the cards

This puzzle's theme relates to card games and gambling. Looking at the grid, we can find several words that connect to card playing:

1. HEARTS (starts at H in row 2, goes down)
2. SPADES (starts at S in row 6, reads up)
3. BRIDGE (starts at B in row 1, goes diagonal)
4. EIGHTY (related to card game Eighty)
5. BETTING (crosses diagonally)
6. PLAYING (connects through the grid)
7. DEALING (connects through letters)

The spangram GAMBLING connects from top to bottom of the grid, which perfectly fits the theme of card games and betting. The words can be found by looking for card game terminology and following the connected letters in any direction (horizontal, vertical, or diagonal).