#4 Undisputed Era vs. DIY
Given the fact that Johnny Gargano has seemingly given into dark impulses and re-joined his tag team partner turned arch nemesis Tommaso Ciampa, it appears that the rebirth of #DIY, in an evil and sinister form, has come.
Naturally then, they should want to recapture their spot as the top tag team they were around this time two years ago. Whilst a match with new champions The War Raiders might make for a good performance with a conventional face/heel dynamic, an epic war with the more evenly-sized Undisputed Era would probably make for an even greater aligning of the stars at a near-future TakeOver special.
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Imagine a long, deep, story-driven match where the two teams make callbacks to their previous epic encounters with The Revival, the Authors of Pain and Moustache Mountain. The psychology, tag team combos and spots, and finishing sequence could be amazing if all parties involved got creative enough.
In fact, both of these teams are so top tier that it wouldn't be a stretch to suggest this not only could potentially become a TakeOver main event but perhaps WWE's first tag team Ironman Match.