When Razorverge of the Burnwillows enters the battlefield, sacrifice it unless you pay 1 life.

When Razorverge of the Burnwillows enters the battlefield, put a land you control on the bottom of its owner's library.

: Add  to your mana pool.

: Razorverge of the Burnwillows becomes a 2/2 white Kor creature until end of turn. It's still a land.