Clock Tower

{t}: Add one mana of any colour.
{3}{t}: Add 4 colourless mana to your mana pool.
{3}: Sacrifice Clock Tower, search your library for
a creature with mana costs converted to 4 or less.
The headquarters of the Mage's Association and a large force in the magic world.
A schoolhouse from where many magi of renown appear one after the other, but there is an obscure darkness behind the scenes of its long history.