|Jafar says: Read my lips and come to grips with the reality!|
Jack is a alter ego for many villains of the DC universe, all of whom are or were members of the Royal Flush Gang. Like the rest of the members, he bears a card themed identity (and the exact "suit") pattern he wears varies from Jack to Jack. When Parademon blew up the House of Secrets, he was thrown from the Secret Six's helicopter by Knockout.
Booster Gold stopped Jack and his Royal Flush Gang from stealing valuable nanotechnology.
This version of the Jack is a western outlaw who tries to kill Jonah Hex only for Batman to save him.