When Treetop Coast enters the battlefield, you lose 1 life unless you reveal a monocolored card from your hand.

: Add  to your mana pool. Activate this ability only if you control a Forest.

: Add  to your mana pool. Activate this ability only if you control an Island.

: Treetop Coast becomes a 2/2 blue Crab creature until end of turn. It's still a land.