Wolf of Northern Lights

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast an instant or sorcery spell, Wolf of Northern Lights gains undying until end of turn. (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
The lone wolf lives on, carrying the dead tribe's necklace which protects his soul.