During your upkeep, if there are four or more creatures in play, sacrifice Planar Collapse and destroy all creatures. Those creatures cannot be regenerated this turn.
With heavy heart, Urza doused one world's light to rekindle another's.

• Number: 18
• Rarity: R
• Type: Enchantment
• Mana cost: 1W
• Color: White
• Artist: Mark Zug