Q: "Dauthi Jackal" says "Sacrifice Dauthi Jackal: Destroy target blocking creature." Can this be any blocking creature, even one not blocking the jackal? Can the jackal destroy even a non-Shadow creature? And, if the jackal is being blocked by a creature that will destroy it, can it still be sacrificed to use this special ability?

A: The Dauthi Jackal destroys any blocking creature, not just shadow creatures. And yes, you may sacrifice the Jackal to destroy the creature blocking it.