Nicolas Probst's Stun build is easily the most surprising deck out of YCS Madrid's Top 16. The unexpected combination of Geargia, Fire Fist, and a bunch of anti-meta cards seem to defy reason. Probst's success is the result of a well-developed strategy that capitalizes on current trends in Shaddoll, Satellarknights, and Burning Abyss decks. His build takes the best "+1" strategies of the last year and brings them together into a single strategy. By doing so he not only maintained a constant stream of monsters, but he also had access to plays and effects that pure Geargia and Fire Fist don't have.
Brotherhood of the Fire Fist - Bear and Brotherhood of the Fire Fist - Gorilla are still solid monsters that can destroy cards on the field, search your deck, and can even be recycled with Coach Soldier Wolfbark. They immediately outclass the Main Deck monsters played by Satellarknights, which gave Probst a clear advantage in that match-up. El Shaddoll Winda can be a concern when you're playing so many destruction effects, but with two Dimensional Prison, two Forbidden Lance, Compulsory Evacuation Device, and a full set of Fiendish Chain, Probst had more than enough ways to eliminate monsters that can't be destroyed by card effects.
With both Macro Cosmos and Dimensional Fissure in his Main Deck Probst had an excellent game one matchup against Burning Abyss: a strategy that plays a ton of cards that would make his Geargia and Hand monsters ineffective. Phoenix Wing Wind Blast is a serious concern, but between his Main Deck tech and his sided Shadow-Imprisoning Mirror and Banisher of the Radiance, Probst could leave his opponent devoid of plays. The rest of his Side Deck picked up rogue matchups: Ally of Justice Cycle Reader can be looped with Gear Gigant X to banish four Light monsters from Lightsworn or Bujin graveyards; Necrovalley shuts down Sylvans and Infernities; and Light-Imprisoning Mirror stops Satellarknight Deneb and Satellarknight Altair from giving Probst's opponent too many extra cards.
Probst's success is a testament to the renewed strength of anti-meta strategies this format. Stun is definitely worth playing and it's also a matchup that's worth preparing for.