#3 Brock Lesnar
This may be one of the biggest dream matches WWE is left with, pitting two of the most dominant forces in recent history against each other. A match between Brock Lesnar and Bray Wyatt would be a spectacle of the highest order, especially with Lesnar's tremendous selling ability likely to make The Fiend even more terrifying.
The feud between Wyatt and Lesnar was a short one, starting at Royal Rumble 2016 and presumably scheduled for WrestleMania 32. But plans seemingly changed and the two had a blowoff match at Roadblock instead, in a Handicap Match where Wyatt never even tagged in.
So despite heavy seeds being planted for the program, the two never actually wrestled. But now, all it will take is a move between SmackDown and RAW for either the Beast or the Fiend. Bray Wyatt could go after Lesnar, stating that he needs to finish what he started over four years ago.
Seeing Brock Lesnar interact with the Firefly Fun House version of Wyatt would be a treat, as would the eventual confrontation. A match between these two is likely to be compelling and stiff. The Beast could give The Fiend a major rub, similar to the one Drew McIntyre received at WrestleMania 36.