Timberline Coliseum enters the battlefield tapped unless you control an enchantment.
: Add or to your mana pool.
Sacrifice Timberline Coliseum: Add or to your mana pool.
: Regenerate Timberline Coliseum.
: Add 
or 
to your mana pool. or to your mana pool.: Regenerate Timberline Coliseum.
