3 - Samoa Joe

During an interview with ESPN back in 2017, Shawn Michaels named Samoa Joe as a guy he'd like to face if he did come back, and obviously Joe was up for the match.
Like a potential match with Brock Lesnar, this would be the flamboyant showman vs. the monster fighter who's twice the size of the babyface. It would give Michaels an opportunity to sell a lot, which was what he did best.
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It'd also be the opposite of a potential match with AJ Styles, as it'd probably be more of a grounded affair, whereas a match with Styles would likely be a lot faster-paced. So, because of that, I think if Michaels does come back, he'd be more willing to wrestle Joe if he had his choice between the two.