Sarkhan's Unsealing (M19) from Core Set 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Daarken
• Card Text:
  Whenever you cast a creature spell with power 4, 5, or 6, Sarkhan's Unsealing deals 4 damage to any target.
  Whenever you cast a creature spell with power 7 or greater, Sarkhan's Unsealing deals 4 damage to each opponent and each creature and planeswalker they control.