(: Add or to your mana pool.)
Unstable Seafloor enters the battlefield tapped unless you control two or more creatures.
: Unstable Seafloor becomes a 2/1 red and blue Ogre creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Unstable Seafloor becomes a 2/1 red and blue Ogre creature until end of turn. It's still a land.
