Since Gambit looks to be giving us the Guild Of Thieves and Guild Of Assassins, the somewhat overly sexualised Domino would seem to be a perfect fit. The comics paint her as mercenary for hire rather than a member of the Guild, but the X-Men films have never been above a bit of tampering with the source material. Her mutant power to alter the probability of any situation would also make her an intriguing addition to a story as steeped in the world of odds as a heist movie with a playing card throwing hero. With Domino becoming an integral member of X-Force, her inclusion in Tatum's star vehicle would also be a natural way of gently pushing at the boundaries of the X-Men Cinematic Universe.