Ervastath, Thrice-Favored

Partner with Xiphalia, Hunter Of The Deep
Whenever Ervastath deals combat damage
to a player:
•If Xiphalia is in your command zone
you may draw a card.
•If Xiphalia is on the battlefield
you may add {g}{g} to your mana pool.
You don't lose this mana
when steps and phases end.