Dropping a card that could help their strategy should be avoided in these situations. In many rummy variations, the Joker is a potent wildcard thatbig banker slots can replace any card in a meld. But the Joker's worth goes beyond simple substitution; how you use it can have a big impact on your chances of winning. Using the Joker to accomplish high-value melds or runs that would be challenging to accomplish with your current hand is one useful tactic.