Underground Burrows enters the battlefield tapped.
, : Add , or to your mana pool.
: Underground Burrows becomes a 2/1 black and red Specter creature until end of turn. It's still a land.
, 
: Add 
, 
or to your mana pool.: Underground Burrows becomes a 2/1 black and red Specter creature until end of turn. It's still a land.
