Theyre literally all over Akihabara and Nakano Broadway, just like the retro game stores, and in most of the shops in Ikebukuro, so youll definitely be tempted
Meanwhile, Yennett, Cryptic Sovereign is one of the most interesting build-around commanders in the set, facilitating a brand-new archetype in odd-converted-mana-cost tribal (while still being fine on its own, with the double evasion making it pretty easy to draw an extra card each turn if you can't cast that card for free), while Varina, Lich Queen finally unites all of the colors of Zombies, so if you are looking to add the white Amonkhet Zombies to the blue Innistrad Zombies on the traditional black Zombie base, she's the best (and only on-tribe) option for your commander
Frillish is placed unusually high on both lists due to Jellicent ex's playability
you can just add in a few utility lands and then round out the list with Swamps
You'll need roughly 2 packs for full coverage