Feitiço
Destrua a criatura alvo. Crie duas fichas de artefato incolor do tipo Tesouro com "

, sacrifique este artefato: Adicione um mana de qualquer cor à sua reserva de mana."
If the target creature is an illegal target by the time Contract Killing resolves, the entire spell doesn't resolve. You won't get Treasures. If, on the other hand, the target is a legal target but isn't destroyed (most likely because it has indestructible), you'll get Treasures.