Strixhaven Stadium - Promo Pack (PSTX) from Strixhaven: School of Mages, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Piotr Dura
• Card Text:
  T: Add C. Put a point counter on Strixhaven Stadium.
  Whenever a creature deals combat damage to you, remove a point counter from Strixhaven Stadium.
  Whenever a creature you controls deals combat damage to an opponent, put a point counter on Strixhaven Stadium. Then if it has ten or more point counters on it, remove them all and that player loses the game.