You may reveal a Gold or Plunder from your hand. If you do not, set this aside, and return it to the Supply at the start of Clean-up.
Encampment is an Action card from Empires. It is a cheap variant of Lost City—a village(Village (card category)) that also increases handsize(Lab variant), a very powerful engine component—but you only get to use it once(one-shot) unless you have a Gold or Plunder in hand. It belongs to a split pile; five copies of Encampment sit on top of five copies of Plunder.