Invasion of Theros // Ephara, Ever-Sheltering (March of the Machine 23) - Rare Magic: The Gathering Card

(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When this Siege enters, search your library for an Aura, God, or Demigod card, reveal it, put it into your hand, then shuffle.