Planar Collapse [The List] RNR028-C Whenever another colorless creature enters

Whenever another colorless creature enters the battlefield under your control

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Promos Type: Artifact — Rarity: Rare Cost: {5}{U}{U} {T}: Exile target instant or sorcery card from a graveyard

Set: Dominaria Type: Creature — Human Knight Rarity: Uncommon Cost: {1}{W} First strike

Set: Beginning Observer Card type: Digimon Rarity: Super Rare Digi type: Ancient Fairy Play Cost: 12 Form: Mega Attribute: Free Digivolve Cost: 5 Digivolve Cost Level: 5 [On Deletion] Return all Tamers to their owners' hands

Set: Oath of the Gatewatch Prerelease Promos Type: Creature — Vampire Shaman Ally Rarity: Rare Cost: {3}{B} Cohort — {T}

Planar Collapse [The List] RNR028-C Whenever another colorless creature entersSet: The List Type: Enchantment Rarity: Rare Cost: {1}{W} 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. With heavy heart, Urza doused one world's light to rekindle another's.