5 Opponents for The Undertaker in future Boneyard matches 

#2 The Fiend Bray Wyatt

Maybe not right now, but soon (Pic Source: WWE)

While many witnessed this match, the most apparent opponent that many would have thought of was The Fiend Bray Wyatt. The connections are quite visible. The Fiend is supposed to succeed The Undertaker as the most feared presence in the WWE. Moreover, the Boneyard match serves as a way for the pair to face off that will help both their characters well.

While John Cena will be taking on Bray Wyatt in a Firefly Fun House match, the presentation of that is yet to be revealed. If the Boneyard match is any indication, it will have the same cinematic feeling that this one did.

With that said, both Undertaker and Wyatt could have a feud that need not take place in a ring. Their characters are perhaps more suited for something more 'cinematic' filled with stunts, horror movie tropes, and a brawl between two forces of darkness.

Imagine Freddy vs. Jason, but done so much better. The Immovable Object vs. An Unstoppable Force would be how the match would be built. The future couldn't get here sooner.