The Master of Keys DSC/4

Set: Duskmourn: House of Horror Commander
Collector Code: DSC/4
Name: The Master of Keys
Type: Legendary Enchantment Creature — Horror
Oracle text: Flying When The Master of Keys enters, put X +1/+1 counters on it and mill twice X cards. Each enchantment card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)
Rarity: Mythic