In the Digimon Card Game, yellow decks have the ability to manipulate their own security (aka life/shields), taking some off, recovering it ect. Queenbeemon and the Royal Base deck, who are dual colored green/black cards, can also manipulate their own security, the gimmick is that they can turn their own security faceup. If a Royal Base deck and/or Queenbeemon deck gets rolling, they can get at least 10 security (you start with 5).