Here the story is this: The Goblins cant use the sled unless the opponent is near a mountain (So they can slide down the mountain on the sled), they have Trample (Since anything they hit will only slow them down), and if they deal damage, they dont untap next turn (Because they have to spend a turn climbing back up the mountain)
The decks incredibly consistent, with playsets of Ancient Stirrings, Chromatic Star, and Chromatic Sphere drawing bundles of cards and mitigating the restrictions of colorless mana while land tutors like Expedition Map find missing pieces
While he can be slowed somewhat by removing him, the fact that the rest of the deck exists to turn sideways for value means that even just getting one portion of triggers instead of an extra large portion can still have the deck start to gain enough momentum that its hard to stop
Time to catch em all (again)
In this deck, we didnt pay the echo costs of Stingscourger and we sure as Hells Thunderdont pay the cumulative upkeep costs of Phyrexian Soulgorger