The Eyrie, Castle in the Sky

The Eyrie, Castle in the Sky enters the battlefield tapped.
{t}: Add {w} or {u} to your mana pool.
{2}{w}{u},{t}: Creatures without flying can't attack
you until end of turn.
"The most splendid work ever built by the hands of
men, a palace worthy of the gods themselves. Surely
even the Father Above does not have such a seat."