You can only activate this card when 1 or more of your Trap Cards are destroyed and sent from the field to the Graveyard by a card effect your opponent controls. Destroy 1 Spell or Trap Card on the field.
Rulings
Netrep Rulings
"Driving Snow" may be activated only after a Trap Card is destroyed. "Driving Snow" may not be activated in a chain with an effect that would destroy a Trap Card.
Trap|
Normal