Yorijon

If Yorijon is in your command zone at the beginning of the game, you gain an emblem with "if a card would be exiled from your graveyard, put it on the bottom of your library instead."
Yorijon's power and toughness are equal to the number of cards in your graveyard.
Whenever you cast a spell, put cards from the top of your library into your graveyard equal to that spell's concerted mana cost.