Mephala, Prince of Secrets

Indestructible, Hexproof
When Mephala, Prince of Secrets enters the battlefield and at the beginning of your upkeep,
place a card from the top of your library onto the battlefield face down. As long as it's face down,
it can't be destroyed or exiled from other player's
spells or abilities.
{p/b}{p/b}: Exile the face down card, then place it back
onto the battlefield face up.