Destroy target creature. Create two Treasure tokens. (They're artifacts with " , Sacrifice this artifact: Add one mana of any color.")
If the target creature is an illegal target by the time Contract Killing resolves, the entire spell doesnâ€™t resolve. You wonâ€™t get Treasures. If, on the other hand, the target is a legal target but isnâ€™t destroyed (most likely because it has indestructible), youâ€™ll get Treasures.