flavorText: With heavy heart, Urza doused one world's light to rekindle another's.
name: Planar Collapse
originalText: 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.
printings: PLST, ULG
text: At the beginning of your upkeep, if there are four or more creatures on the battlefield, sacrifice this enchantment and destroy all creatures. They can't be regenerated.
type: Enchantment