Planar Collapse

Enchantment

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.

With heavy heart, Urza doused one world's light to rekindle another's.

Mark Zug

Legalities

NOT LEGALStandard
NOT LEGALPioneer
NOT LEGALModern
LEGALLegacy
LEGALVintage
LEGALCommander
LEGALOathbreaker
NOT LEGALAlchemy
NOT LEGALHistoric
NOT LEGALBrawl
NOT LEGALTimeless
NOT LEGALPauper
NOT LEGALPenny