Relic Retriever

Flying, vigilance, undying (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.)
When Blade Retriever dies, if it had no +1/+1 counters on it, choose an aura or equipment card in your graveyard. When Blade Retriever is returned to the battlefield this turn, it enters the battlefield with the chosen permanent att