Wave Den enters the battlefield tapped unless you pay .
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Wave Den becomes a 2/2 blue Crab creature until end of turn. It's still a land.
.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
: Wave Den becomes a 2/2 blue Crab creature until end of turn. It's still a land.
