Jack Hammer first went to college with Peter Parker, but was considered a huge nerd even by his standards. It wasn't until a time traveling Deadpool (pretending to be Peter Parker) took him on a drinking binge that he really began to loosen up and... basically ruined his life, going from an A+ student to a high-tech loser. At some point he became a weapons dealer and tech-guy for Deadpool.
More recently, he was seen acting as an armored security force in Las Vegas going by the name "The House". After battling Deadpool (and temporarily defeating him), the Merc offered to work with Weasel as his sidekick using a secondary set of armor and the name Wildcard. During a battle with Grizzly, Wildcard then made House look useless, so the next time Deadpool proposed that Weasel switch identities and take the credit for Wildcard's heroics. During a second fight with Grizzly, Weasel made Wildcard look like the hero of the fight, while Deadpool (as the House) stood by doing nothing and subsequently escaping with Grizzly and the stolen money. Now that House had become a criminal, Weasel tried to defeat Deadpool in battle, but the Merc escaped despite seemingly being killed by Weasel (still as Wildcard). When Wildcard bosses tried to find a body inside the House armor there was nothing, so Weasel couldn't clear his name and remained a fugitive, while Deadpool resumed the identity of Wildcard (although he renounced it shortly thereafter).