For example, the players can shuffle the Randomizer cards for all Kingdom cards and draw 10 to select the cards for the game.Use them as the last card in their respective stacks. They are used to indicate that the stack has run out so that it is easier to know how close the game is to ending. @krisa suggests that if you use sleeves to use a different colored sleeve for the randomizer cards. This will make it much easier to keep them separate.