Mass Diminish (C19) from Commander 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: E. M. Gist
• Card Text:
  Until your next turn, creatures target player controls have base power and toughness 1/1.
  Flashback 3U (You may cast this card from your graveyard for its flashback cost. Then exile it.)