What competitive formats is Not Dead After All played in
Heres what I found: Adventurers' Guildhouse Animate Dead Bag of Holding Cartographer's Survey Chain Lightning City of Brass Clone Commune with Nature Cone of Flame Counterspell Earthbind Fabricate Fireball Gaseous Form Lightning Bolt Mirror Image Polymorph Resurrection Ring of Three Wishes Underdark Beholder Universal Solvent There's also Kharis & the Beholder, another Heroes of the Realm card from 2018 with a clear D&D influence (check that stylized ampersand in the card name!)
If you're looking for authentic, straight from Japan merch, Pokevault won't let you down

XY Single Pack Blister [Dragonite] Dragonite Collector's Pin 3 Pack Blister $309.00 Dragonite EX Box $263.13 Kanto Power Collection [Dragonite EX/Pidgeot EX] $493.26 Kanto Power Mini Tin [Dragonite] $36.03 Dragonite Dragons Tin $65.93 Checklane 2 Mini-Pack Blister [Dragonite] $24.99 Dragonite Dragons Tin (Walgreens Exclusive) $52.73 Drowzee #60Common $0.08 Durant #13Common $0.04 Phione #45Rare $0.09 Regieleki VMAX #58Ultra Rare $1.23 Virizion #14Rare $0.06 Ponyta #21Common $0.07 Pikachu #49Common $0.51 Alolan Vulpix V #33Ultra Rare $2.10 Araquanid #48Uncommon $0.10 Reshiram V #24Ultra Rare $1.06 Dark Dragonite #5Holo Rare $240.97 Dark Dragonite #15Rare $92.41 Dark Dragonite - 15/109 (EX Team Rocket Returns) #15Holo Rare $125.49 Dark Dragonite (22) #22Rare $38.95 Dark Dragonite (5) #5Holo Rare $180.45 Dragonite #2Holo Rare $189.66 Dragonite #18Rare $15.29 Dragonite #5Holo Rare $30.59 Dragonite #83Holo Rare $21.44 Dragonite #96Holo Rare $4.09

The Pokmon Company has thus far resisted including the old cards in its online offerings, likely due to that differenceand to the fact that the games first two generations were published by Wizards of the Coast
Midnight Hunt's White Cards A few white cards in Midnight Hunt are particularly valuable, proving white mana still has a lot to offer