Today I saw this post on r/iPad from /u/jdayellow — in it, they’ve plugged one end of a USB-C cable into the iPad and the other end into the Magic Keyboard’s USB-C passthrough port (thus: “unlimited power”). As it turns out, Apple considered the possibility users might use the two USB-C ports to create a universal connector ouroboros and included a warning on the Magic Keyboard’s support page:
I’m not entirely sure what the consequences of doing this would be, considering the wattage output from the iPad Pro is substantially lower than most chargers that you might plug into the Magic Keyboard’s USB-C passthrough port. Anyway, finding this support page also turned up this .gif of the Magic Keyboard being opened (sped up with some Shortcuts magic):
