Building your hand & thwarting your opponents' plans are both made possible by this dual focus. For example, if you see that your opponent is picking up cards from a spebonus appcific suit, it might be a good idea to hold onto cards that could finish their run and keep them from reaching their objective. Prioritization and Card Management. Card management is a crucial component of strategy in 777 Rummy. Depending on how likely they are to form melds, players should rank which cards to keep and which to discard.