Coastal Bog enters the battlefield tapped.
: Add or to your mana pool.
: Coastal Bog becomes a 2/1 blue and black Shapeshifter creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.: Coastal Bog becomes a 2/1 blue and black Shapeshifter creature until end of turn. It's still a land.
