Rhinoseeker is tech from the Future Future Future Future League. Using reprints from 10th Edition, Rhinoseeker has been identified as the perfect deck.
Rumors started when a partial decklist was leaked when Mark Rosewater started talking about how he wrote for Roseanne and the first letter of each sentence, when descrambled, formed card names. As soon as "Forest" was decoded, we knew we had a power house coming down the pike, but no one was ready for what was to come next.
Using the same technique on Mark's article about why leaks are supposedly bad, Crash of Rhinoes and Stormseeker were decoded.
Forest, Crash of Rhinoes, Stormseeker. Sure, that's a menace to Type 2, but those cards already are in Vintage. The strongest combo since Lifeforce and Dandan was about to turn Type 1 inside out and whomever figured out the rest of the decklist first would win the 2004 Vintage Magic Moneyfest Spectacular and be awarded the golden-yellow shine of an Oscar Tan (Oscar ©AMPAS) from the Tan-and-Wash in Boston just south of Melville's Seafood.
Unfortunately, you can't find any verifiable info on the real decklist other than Forest, Crash of Rhinoes, and Stormseeker. People who know other cards intentionally seed lies into the rumor mill to keep people from learning their Secret Tech.
I'll give one hint though, since I play not for glory and melanin. While "Stormseeker" was decoded only once, "seeker" was found twice, leading many to think that there are two in the deck. I suspect that Stormseeker will be restricted to try to give other decks at least register their decks before they lose, and that Seeker will be used in the deck. That way, Stormseeker can't be blocked except by White and/or Artifact creatures.