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When using the Brewmaster ability to gain a lazy peon to your discard pile. I assumed this meant that the lazy peon is recruited from outside of the game. If so, is using the Brewmaster ability only possible if there are spare lazy peon cards available that are either; leftovers from having fewer players or they are lazy peon cards that have previously been fed to monsters?
That's correct, they need to be there for you to be able to grab one