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Towns Travel the Overworld is the truth, though there arent too many other payoffs (The Wandering Minstrel is decent, but five towns is a ton in practice)
A new way to bring unusual, themed versions of (mostly) existing cards to players, Magic: The Gatherings publisher Wizards of the Coast launched the Secret Lair program in 2019
On the other hand, in general, the partner pairings score low, with one exception: the Shark / Human combo of Shabraz, the Skyshark / Brallin, Skyshark Rider has 141 decks (which is especially surprising since Shark wasn't a creature type in Magic before Ikoria and Commander 2020 ), making it the most popular partner pair by a significant margin
For those brimming with questions, head to DailyMTG, where Gavin Verhey has a comprehensive article about Archenemy in Duskmourn: House of Horror
After that though, you could consider a lands-matter sub-theme, playing multiple lands a turn to stack up the triggers