You might wanna think twice before buying that 2DS. Whichever 3DS of your's that you currently have Ironhax on, if you have anything on it that you do not want removed, the System Transfer process will remove everything from the source device. Also, remember that a single NNID cannot be used across multiple 3DSes, only with one Wii U.
Edit: In case you missed my point, Ironfall is no longer on the e-shop, so system transfer is the only way to get it onto a 2DS that you might buy. Also, idk about OoTHax, but Ironhax and Tubehax are actually Ninjhax running on Ironfall, Youtube, and now Smash Bros.