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