Tommaso Ciampa
We got a hint of what this feud would be like when Roman Reigns and Tommaso Ciampa went toe to toe back at Survivor Series as part of the big elimination match between RAW, SmackDown and NXT.
If anyone can get inside the head of someone as consistent and strong as Roman Reigns, you just know it's going to be Blackheart. We like the idea of him tormenting Reigns for months on end, potentially not even in pursuit of a title.
WWE is at their very best when they give Superstars the chance to tell a great story, and with these two, there would be no need for any kind of scripting. Give them a basic idea of what to go out there and say, and let them do the rest.
This bout would probably go down in a few years' time, but by the time it rolls around, both men would almost certainly be bonafide main eventers.
Start the feud at the Royal Rumble, and you're off to the races from there.