Because wild cards can be used to replace any other card in a set or run, they are useful for completing sets and runs that would otherwise be incomplete. Carefully analyzing which sets & runs can be completed withonline slots real money app wild cards and which combinations are most likely to be useful is a crucial part of using wild cards effectively. Strategic Use of Wild Cards. For instance, in Rummy Soft, finding a winning hand can often depend on utilizing a wild card to finish a sequence of consecutive cards of the same suit. Keeping track of the wild cards that have already been used or discarded during each game is another crucial part of using them.