Chained Skyfortress

Chained Skyfortress enters the battlefield tapped
{t} Add {r} to your mana pool.
{t} Put a broken-link counter on Chained Sky-
fortress, then add {w} or {u} to your mana pool.
Sacrifice Chained Skyfortress when it has
3 Broken Link counters on it.
The Cyclops kings of old really knew how to hold
down the fort!