Worse yet, in November 2024, Rosewater further confirmed that while WotC had previously promise to make a Universes Within equivalent to every Universes Beyond card, they had chosen to abandon this specific game plan in favor of more case-by-base solutions: We want to make sure that players who arent able to purchase the Secret Lair have access to the card mechanically
The Easiest Companion to Build Around Yorion, Sky Nomad is the easiest companion to build around since any card counts towards the deck total

Sandshrew Mouse Pokmon Evolution Line Sandshrew Source: official-artwork Source: official-artwork Source: official-artwork Genera Mouse Pokmon Evolution Line Sandshrew Sandshrew 035/076 Storm Emeralda Sandshrew 020/063 Mega Brave Sandshrew 057/101 Mask of Change Sandshrew 027/165 Pokmon Card 151 Sandshrew 027/165 Pokmon Card 151 Sandshrew 205/414 Start Deck 100 Sandshrew 034/067 Blue Sky Stream Alolan Sandshrew 051/095 Alter Genesis Sandshrew 021/054 Full Metal Wall Alolan Sandshrew 001/066 Ultra Moon Alolan Sandshrew 020/114 GX Battle Boost Alolan Sandshrew 077/SM-P Sun & Moon Promos Alolan Sandshrew 011/049 Beyond A New Challenge Alolan Sandshrew 010/050 Islands Await You Sandshrew 052/087 20th Anniversary Sandshrew 031/059 Blue Shock Sandshrew 031/059 Cold Flare Sandshrew 045/070 SoulSilver Collection Sandshrew 052/100 Beat of the Frontier Sandshrew DPBP#028 Secret of the Lake Sandshrew 051/086 Holon Research Tower Sandshrew 045/084 Rocket Gang Strikes Back Sandshrew 033/053 Miracle of the Desert Sandshrew 049/088 Split Earth Sandshrew 016/018 McDonald's Pokmon-e Minimum Pack Sandshrew Quick Starter Gift Set Brock's Sandshrew Gym Expansion 1: Gym Leader Stadiums Sandshrew Expansion Sheet No

Learn how to play the card game, build and manage decks and duel with other card players in step-by-step tutorials
Instead, you had entire expansion packs that you likely had to buy from a store or, in later years, from an online game portal, similar to Steam or the Epic Games Store