Eradicator Valkyrie - Promo Pack (PKHM) from Kaldheim, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Tyler Jacobson
• Card Text:
  Flying, lifelink, hexproof from planeswalkers
  Boast — 1B, Sacrifice a creature: Each opponent sacrifices a creature or planeswalker. (Activate this ability only if this creature attacked this turn and only once each turn.)