Was this back when Paralyzed was doing his thing?
Paralyzed got to #1 on the leaderboard by proposing the same set of 10 cards (which were perfectly suited to the KC/goons/masq pin: Bishop, Colony, Goons, Island, King's Court, Laboratory, Masquerade, Mint, Peddler, Platinum, Tactician, and Vault) and winning almost every game.
[edit]Yeah, Paralyzed jumped to level 50 or so in September 2011 with something like a 135-10 record (almost all of those with the same set of cards). Then, when games with constraints stopped counting towards the leaderboard, he would play the bare minimum number of games so as not to be booted off the leaderboard from inactivity, that's how the leaderboard worked at the time I think? And so he stayed level 50 or so, and thus at the top of the leaderboard, until those games got removed from his ranking retroactively, sometime just after November 2011.
Or at least I think that's how it went down.[/edit]