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