Force an opponent to roll with disadvantage or subtract a penalty (like a d4) from their total.
Homebrew threads often contain links to simplified versions for 5E.
For players who prefer physical cards, official licensed versions and custom fan-made sets are available at retailers like Gootzy Gaming and Etsy . Go to product viewer dialog for this item.
Instead of static card values, many versions have players roll a d10 or a pool of d6s to determine their round score.
Often includes "spying" mechanics or wins on a tie.
A standard homebrew deck often consists of nine base unit/ranged cards and one "Leader" card that determines the player's faction. Faction Examples in D&D