Shelldock Castle enters the battlefield tapped.
: Add or to your mana pool.
Sacrifice Shelldock Castle: Add or to your mana pool.
: Shelldock Castle becomes a 2/2 blue Cephalid creature until end of turn. It's still a land.
: Add 
or 
to your mana pool. or to your mana pool.
: Shelldock Castle becomes a 2/2 blue Cephalid creature until end of turn. It's still a land.
