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