Ace in the Hole is slang for an ace that keeps his powers hidden and pretends to be a nat, a normal human. It's much more than just wearing a mask and adopting a codename. Aces that are in the hole never use their powers in a way that can be traced back to them in any identity. Many aces in the 1950s, when anti-wild card persecution was at its highest, were aces in the hole, never using their powers in public. In more modern times, certain individuals keep their ace natures hidden for a variety of reasons. Senator Gregg Hartmann was such a person, hiding his emotion manipulation powers from everyone.