"Snow Plow Hustle Rustle" can be searched to Special Summon it during your opponent's turn. Since its effect only forces yourself to destroy cards in your Spell & Trap Zone, this card won't be destroyed.
With this card's first effect, the following can be Special Summoned:
Special Summon a Level 10 EARTH Machine-Type monster during your opponent's turn with "Call of the Haunted" (or something similar) and activate this card's first effect. This way, your opponent's damage won't be halved during your upcoming turn and this card's second effect will be used instead of its first.
Discard "Ruffian Railcar" to activate this card's second effect, so that another Level 10 EARTH Machine-Type monster can be searched out during your End Phase.
Use "Planet Pathfinder" and "Terraforming" in Decks that use this card, since even if there are enough copies of this card in your hand or on the field, the useless copies of these cards can be discarded to activate this card's second effect.