(Treetop Clachan isn't a spell.)
When Treetop Clachan enters the battlefield, sacrifice it unless you pay 2 life.
All creatures have Swampwalk.
: Add to your mana pool. If you played a land this turn, Add to your mana pool instead.
: Add 
to your mana pool. If you played a land this turn, Add 
to your mana pool instead.
