Reserves: Whenever one of your Agents or Spies attacks and does damage (after damage prevention), you may put 1 damage counter on that Agent or Spy. If you do, your opponent discards a card at random from his or her hand.
Keywords
Reserves
Reserves: [Ability]: A layered, static ability that means, "The following ability works while, and only while, it's in the build zone." The granted ability remains to be the ability of its type. (For example, activated abilities granted by Reserves may be disrupted.)