When Elena enters, return target non-Assassin historic card from your graveyard to your hand. (Artifacts, legendaries, and Sagas are historic.)
Whenever you cast a historic spell, put a +1/+1 counter on Elena.
Looks like talking alone won't cut it. You're going to have to feel some pain!
MTG TCG Magic The Gathering Trading Card Game Commander Authentic Tournament Ready CCG Collectible Individual EDH Casual Play Single