Overgrown Burrows enters the battlefield tapped unless you control one or more creatures.
: Add or to your mana pool.
Sacrifice Overgrown Burrows: Add or to your mana pool.
, : Add one mana of any color to your mana pool.
: Add 
or 
to your mana pool. or to your mana pool.
, : Add one mana of any color to your mana pool.
