Wasn't able to find it before, but took another look. It's this (or similar, not sure if this is the exact model): https://www.amazon.com/Lepy-LP-2024A-Amplifier-Stereo-Supply/dp/B00ULRFQ1A Very inexpensive and cheaply put together, but does work reasonably.
Yggy's gen 3 is the third generation of Schiit's USB implementation, but is a USB 2 connection. Wyrd is a USB 2 device and is device-agnostic, it just reclocks and repeats the data for any USB 2.0 (or 1.1) device. So yes, Wyrd works fine with Yggy.
I'm selling the official Sennheiser CH 800 S balanced cable (silver) that came with my HD800S. Cable is brand new and has never been used, I just took it out of its pouch to take pictures.
Cable and pouch are included; since it came with my HD800S I do not have the retail box. Price includes Paypal and shipping to CONUS.