Lagna-Vile, Home of the Exiled

{t}: Add {u} to your mana pool.
Tap a blue creature you control, {t}:
Return {x} Instant, Enchantment or Sorcery spells from your graveyard to your hand, {x} being the number of untapped creatures you control. If a creature entered the battlefield under your control this or last turn, you may cast a spell from your hand without paying it's mana cost.
No one that does not belong to Lagna-Vile ever succesfully got there by any means.
—Hangu Shebat, Defense Commander