MTG has many mechanics that revolve around artifact numbers and density, so we have not only affinity cards here, but also improvise, metalcraft, and other artifact-matters mechanics and cards
For me the master set is all the ARs and SARs along with the BWR Resh and Zek (no normal cards or normal full arts or poke/master balls) in dex order
You also get a metallic coin, two booster packs from the special Pokmon TCG: Scarlet & Violet Prismatic Evolutions expansion, and a code card for Pokmon TCG Live
Glissa is SO good in those decks, since she provides a lot of utility regardless of the board state
Would I rather top deck it than a land while I'm empty-handed
Purpose: Consider whether you plan to open the pack to chase rare Pokmon-ex or keep it sealed for the collection