Make Disappear
Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.)
Counter target spell unless its controller pays 
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Illustrated by Inka Schulz
This printing
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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.
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.”
You may sacrifice only one creature to pay a spell's casualty cost, and you copy the spell only once.
