Snow-wurm Ram

Whenever Snow-wurm Ram becomes blocked, exile each creature blocking it until Snow-wurm Ram leaves the battlefield.
Dismember {1}{w}{u} ({1}{w}{u}, {t}: Put a -1/-1 counter on target creature and create a 0/1 colorless Appendage creature token.)
Tap three untapped Appendages you control: Target creature must block Snow-wurm Ram this turn if able.