They Came from the Pipes - Duskmourn: House of Horror Commander

When this enchantment enters, manifest dread twice. (To manifest dread, look at the top two cards of your library. Put one onto the battlefield face down as a 2/2 creature and the other into your graveyard. Turn it face up any time for its mana cost if it's a creature card.)

Whenever a face-down creature you control enters, draw a card.