mewtwo v pokemon go promo card VSTAR (086/078) [Pokémon GO] 30 Retreat Cost Mewtwo V SWSH229 Pokémon GO

Art by Kaja Foglio

Their main use is in decks that are trying to cheat into play some imposing, game-ending threat, whether thats Blightsteel Colossus, Griselbrand, or Atraxa, Grand Unifier

These elusive cards could be bought at specific retailers and at the D23 Expo

I think Decay will be hard to beat, but depending on the threats that gets played, this might be worth a slot (as it hits Karn and Urza among other things)

P/T Number 458 Language Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) You may choose to discard your hand even if your hand contains zero cards

Now you know how a sideboard works in MTG, how to build one, and how they vary across formats