Tower of the Archmagus

Tower of the Archmagus comes into the
battlefield tapped unless you reveal a
wizard card from your hand.
{t}: Add {w}, {u} or {r} to your mana pool.
"Prideful wizards make taller towers than their
peer's, and the really self obsessed make
flying towers with the obvious inclination that
they think they own the whole world."
- Nathanial, the North Star