Chris Brown, the director of Global Esports & events producer at The Pokmon Company International, told the press what kind of thinking went into making the event special
Kindred Discovery won't fit every deck, but it can be a good fit in merfolk decks, or in blink decks that care about good ETB creatures, like wizard decks

Shimmering Skies Enchanted Cards #205 - Prince Naveen Franchise: The Princess and the Frog Alternative Card: Prince Naveen (Legendary) #206 - Vanellope Von Schweetz Enchanted Franchise: Wreck-It Ralph Alternative Card: Vanellope Von Schweetz (Rare) #207 - Revive Enchanted Franchise: Alternative Card: Revive (Rare) #208 - Archimedes Enchanted Franchise: The Sword in the Stone Alternative Card: Archimedes (Uncommon) #209 - Olaf Enchanted Franchise: Frozen Alternative Card: Olaf (Rare) #210 - Finders Keepers Enchanted Franchise: Aladdin Alternative Card: Finders Keepers (Uncommon) #211 - Clarabelle Enchanted Franchise: Disney Alternative Card: Clarabelle (Legendary) #212 - Scar Enchanted Franchise: The Lion King Alternative Card: Scar (Rare) #213 - You're Welcome Enchanted Franchise: Moana Alternative Card: You're Welcome (Uncommon) #214 - Donald Duck Enchanted Franchise: Disney Alternative Card: Donald Duck (Legendary) #215 - Robin Hood Enchanted Franchise: Robin Hood Alternative Card: Robin Hood (Legendary) #216 - Ratigan's Party Enchanted Franchise: Disney Alternative Card: Ratigan's Party (Uncommon) #217 - Mufasa Enchanted Franchise: The Lion King Alternative Card: Mufasa (Legendary) #218 - King Candy Enchanted Franchise: Wreck-It Ralph Alternative Card: King Candy (Uncommon) #219 - Royal Tantrum Enchanted Franchise: Robin Hood Alternative Card: Royal Tantrum (Rare) #220 - Snow White Enchanted Franchise: Snow White Alternative Card: Snow White (Super Rare) #221 - Arthur Enchanted Franchise: Sword In The Stone Alternative Card: Arthur (Legendary) #222 - Bad-Anon Enchanted Franchise: Wreck-It Ralph Alternative Card: Bad-Anon (Rare)

Because its not specifically called out in WotCs terms and agreement, third parties arent technically prevented from selling Arena codes for special products, decks, or individual cards
Bontu the Glorified by Daniel Ljunggren Bontu the Glorified | Illustration by Daniel Ljunggren Now this is what a god should look like
Arabella, Abandoned Doll Arabella's deceptive porcelain facade conceals a deep hatred for survivors and a burning desire for vengeance