The 3rd stage of the annual John Van Caneghem Tournament (2007).

Well, I wouldn't say that; you take some orb, like Inhibition or Vulnerability, and sell about 5-6 scrolls for around three thousand each (at the start of the game), you've made an extra twenty thousand, bribed some troops, and you're ready for battle.
But although there is another bug—I think it only works on Hot Seat—where you can see the opponent's forces by viewing their turn.And where do you get 5-6 scrolls at the start of the game? Where do you find a shop at the start of the game? Where do you get Inhibition or Vulnerability orbs?? In official Tournaments, leaders usually complete the map in no more than two weeks. In exceptionally difficult cases, within a month. So think about it—do they even have time to use this bug :) No, I'm not arguing that there are maps where all of this can be found in the first week—that's exactly why organizers select maps for tournaments and check how things work before launching a tournament on them.