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Voodoo Pins
Artifact – Equipment
Whenever Voodoo Pins becomes unattached from a creature, sacrifice that creature.
, : Voodoo Pins deals 1 damage to target nonartifact creature and 1 damage to you. If that creature is
put into a graveyard from play this turn, return it to play under your control and attach Voodoo Pins to it.

This is pretty interesting. You can use it on any creature that is about to go to the grave for any reason; but when it's attached to a creature it's ability can't be used right? If so, I think that balances it out pretty well.

it can be used even if equipped, but only once per turn