(Windbrisk Thicket isn't a spell.)
When Windbrisk Thicket enters the battlefield, sacrifice it unless you pay .
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.
