Mareel, Oracle of Erebos

Tainted Pact- When Mareel, Hand of Erebos dies, you may pay {1}{b}. If you do, mill the
top ten cards of your library, then search
your library for a card, reveal it, and put it
into your hand. Then shuffle your library.
You may cast Mareel, Hand of Erebos from
your graveyard as long as you control a full
party.