(: Add or to your mana pool.)
Obsidian Burrows enters the battlefield tapped.
: Obsidian Burrows becomes a 2/1 black and red Horror Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Obsidian Burrows becomes a 2/1 black and red Horror Rat creature until end of turn. It's still a land.
