Problematic Volcano - No Symbol (CMB2) from Mystery Booster Playtest Cards 2021, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Gavin Verhey
• Card Text:
  When CARDNAME enters the battlefield, it deals 4 damage to any target. Then, starting with you, each player assigns their creatures to the left or right of the volcano. Creatures enter the battlefield to the left or right of the volcano.
  Creatures can’t block creatures on the other side of the volcano.