You can strategically gather the cards you need to form melds while keeping your opponents from finishing their own sets & runs by keeping an eye on the cards that are in play. Concentrating on gathering low-value or common-suit cardrummy earn logins—cards that are likely to be useful in multiple melds—is one tactic that works well. Knowing which cards to discard and which to hold onto is a crucial part of strategically creating melds. It might be wise to hold onto cards that are similar in rank or suit, for instance, in case you draw more of the same kind later on. However, it might be wise to discard cards that you don't think will form melds in order to keep your opponents from using them against you.