Silverquill, the Disputant
Flying, vigilance
Each instant and sorcery spell you cast has casualty 1. (As you cast that spell, you may sacrifice a creature with power 1 or greater. When you do, copy the spell and you may choose new targets for the copy.)
Illustrated by Mark Zug
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Casualty N means "As an additional cost to cast this spell, you may sacrifice a creature with power N or greater." and "When you cast this spell, if a casualty cost was paid for it, copy it. If the spell has any targets, you may choose new targets for the copy."
The copy of the spell is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell won't trigger.
If you pay the casualty cost of a spell, the copy will resolve before the original spell.
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
