Planar Collapse #18
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Card Details
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.”
Illustrated by Mark Zug
Rulings (3)
Oct 4, 2004
The ability is not optional.
Oct 4, 2004
This ability does not trigger at all if there are not 4 or more creatures on the battlefield. It also checks this at the start of resolution and does nothing if this is not still true.
Jun 15, 2010
If this card is not on the battlefield when the ability resolves, then you can't sacrifice it. However, you still destroy all creatures.