Planar Collapse [Urza's Legacy]

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Set Name:	Urza's Legacy
Rarity, #:	Rare, #18
Card Type:	Enchantment
Card Text:	At the beginning of your upkeep, if there are four or more creatures on the battlefield, sacrifice Planar Collapse and destroy all creatures. They can't be regenerated.
Flavor Text:	With heavy heart, Urza doused one world's light to rekindle another's.
Artist:	Mark Zug