When Undead Butler enters the battlefield, mill three cards. (Put the top three cards of your library into your graveyard.) When Undead Butler dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

+1: Create a 1/1 white Soldier creature token with lifelink. −2: Put two +1/+1 counters on target creature. It becomes an Angel in addition to its other types and gains flying. −6: Return all nonland permanent cards with mana value 3 or less from your graveyard to the battlefield.

Fathomless descent — Return to the battlefield target nonland permanent card in your graveyard with mana value less than or equal to the number of permanent cards in your graveyard.