To expand on what the others have said, you can use the pick by comparison condition if you have multiple instances of the same object that have different variables. Eg. You use a single card object and you have 52 instances. Each has an instance variable from 1 to 13 which tells you what number the card is.
If you want to pick all the 9 cards, to make some sort of change you would:
Pick cardobject by comparison where cardobject.variable = 9
any actions that you now apply to card object within that event will only be applied to card objects with the variable 9.