The Quantum Courser from the Megadungeon turns into a random mount (from the Past) and some datamining has lead us to a list of possible mount drops, which includes the Infinite Timereaver.
Megadungeon Omni-MountThe Reins of the Quantum Courser mount was added as an extremely rare drop from the Patch 10.1.5 megadungeon, Dawn of the Infinites. Previously MrGM tweeted that someone in his group got a Reins of the Quantum Courser and when the player used the item, they got Midnight's Eternal Reins from Karazhan. We don't know exactly what other mounts this can turn into, but some datamining could lead us to some speculation.
Reins of the Quantum Courser Mounts Speculation Dungeon MountsBased on some datamining, we've found 16 lines of data that are linked together that all have Asset IDs. These asset IDs seem to correspond to valid Mount IDs — one of which happens to be Midnight's Eternal Reins (Mount ID: 875) and all happen to be dungeon mounts. This isn't confirmed, but otherwise this would be quite the coincidence that they're all specifically Dungeon Mount IDs and it does mean that this list could be a possible list of the Quantum Courser mounts. However, it of course could be something else. Once again, this list is unconfirmed and is speculation. If you get a mount that isn't on this list, please let us know! If we take these 16 lines of data and treat the asset IDs to Mount IDs, here are the list of mounts that we get:
Deathcharger's Reins Reins of the Raven Lord Swift White Hawkstrider Reins of the Blue Proto-Drake Reins of the Drake of the North Wind Reins of the Vitreous Stone Drake Armored Razzashi Raptor Swift Zulian Panther Reins of the Infinite Timereaver Midnight's Eternal Reins Sharkbait's Favorite Read more on wowhead.com