Smilodon

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Smilodon started developing its adult saber-teeth when the animal turned one-and-a-half years of age, shortly after the completion of the eruption of the cat's baby teeth. The muscles used in making the powerful bite were developed at about one-and-a-half years old as well, eight months earlier than in a modern lion.