Dingir Proxy Card (ディンギル代理カード) are special cards that included in the sealed packs of Booster 17: Code:Dingir - Chain Betrayal or Booster 18: Code:Dingir - Waker's Genesis. As suggested by the name, they are "proxy" or substitute card for the real "Dingir" cards, specifically made to be used in the Sealed Battle and other sealed format.