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