DC comic book rogue Double Down was nicely introduced during Restoration, and his arrival was heralded by a testing out of his skills. Taking out the Ghost whod tangled with Diggle earlier on in the episode, we saw Double Down pull cards from his tattoos and fire them at the doomed soldier. Wed soon find out that Cisco (who else?!) had named this rogue, and we also heard that he was conveniently having some tattoo work done when the particle accelerator explosion happened at the start of The Flash. Whilst thats a tad different from Double Downs comic book origin where he initially becomes bonded to a cursed deck of cards it kinda works in the scope of the shared universe inhabited by Arrow and The Flash.