best starter deck pokemon trading card game gameboy for Game Boy Official Nintendo Player's Guide from Nintendo Power: Nintendo Power: 0045496691790 Books Game Boy-Style Pokémon TCG Deck

So I googled them to find out the answer

To learn more about those, head over to our articles: Commander Brackets Beta Update What is the New Commander Bracket System

Set Boosters also drop an art card, and in Dominaria United Set Boosters, signed art cards appear twice as often as in previous standard-legal Set Boosters

It's an answer to answers - commonly run in decks to answer removal that's targeted like Swords to Plowshares or Beast Within or mass like Blasphemous Act or Damnation

I believe that we can glean a hint of the answer in Mark Rosewater's latest State of Design article, from July this year

And if somebody exiles your graveyard, descended just shrugs and says, Who the cave cares? Descend X cares about the total number of permanent cards in your graveyard