The old deck builder was based on the version in the original Game Boy game, which obviously lacked a lot of the features of more modern deck builders
filled with special events and so much more, Konami is marking the occasion with special commemorative releases that celebrate the history of the beloved card game
These consist of a two-character, alphanumeric set identifier, a hyphen-minus, and a two-digit set position number, e.g
Halvar, God of Battle / Sword of the Realms This came out when WotC seemed to be trying very hard to make equipment matters a thing (and kinda did, to be honest)
Muscle Sliver, Predatory Sliver, and Sinew Sliver all are iconic mainstays in Modern, Legacy, and Pauper
Mason invites you to choose from one of three theme decks built around Bulbasaur, Charmander, or Squirtle