Would a new scenario tag that swaps player parties be of use here? I haven't looked into how much work it would be, but I can if folks would like me to.
That kind of scenario would be UBER cool in general. Just imagine trying to pilot someone else's build.. against your own! I mean, that could be a tournament by itself, forget the original idea of this thread.
In all seriousness, I think there should be some good rules to work around. 1. Requiring that all tokens be used is pretty obvious (otherwise it would be hard for either team to win with such low quality stuff, games might be won on time). The real question is if undervaluing tokens (using a major token when a minor one is needed) should be allowed. Maybe a limit of 1-2 undervalued token should be allowed? 2. Here's proof that No Duplicate Items will be necessary: Use 3 of this: Suicide Priest Human Priest Axe Of The Dark Soul Axe Of The Dark Soul Jet Armor Defensive Buckler Sticky Slippers Tome Of The Withering Source Tome Of The Withering Source Tome Of The Withering Source Novice Guidance Focused Healer 3 x Talented Healer 1 x Wild Run 1 x Attack, Soldier! 1 x Defender's Block 6 x Demonic Revenge 1 x Traveling Curse 2 x Raging Strike 1 x Vulnerable 1 x Block 8 x Unholy Wellspring 1 x Jump, Soldier! 1 x Loner 2 x Demonic Power 1 x Frenzy Aura 2 x Immovable 4 x Weak Chop Basically, there's a good chance that they have all committed suicide by round 2 (with a significant chance of suicide by round 1). One token is undervalued here, but you can use Bniff's Boots for the boots slot to the same effect. 3. I think there should be a minimum number of attacks/attack cards so games don't become boring, long, and unfun. 4. A minimum team health of 75 (or any other agreed value) is a good idea, as previously mentioned. Having 3 elf wizards with suicidal items or having the above priest changed into an elf (to have even more traits) would be really bad. 5. There should be some way to reward the deck builder for his deck losing... Maybe something like this: If your deck loses, you gain points equal to 6 minus the number of stars the team with your deck acquired. If your deck wins, you lose points equal to the number of stars the opposing team acquired. If you yourself lose, your score is unaffected. If you yourself win, you gain 6 points. (This way, the deck builder gets rewarded, but winning yourself is still more reliable and important.) 6. If there's a way to transfer stored party files, a round-robin format might be a good idea. 7. Having your own deck as your opponent all the time can also be interesting. This way, Farbs's 'switch parties' scenario tag could be used.
Definitely some parameters are necessary, I would caution against too many in attempts to make the tourney "perfect." Two reasons: 1) It's a crazy tournament, let some bedlam be part of the fun. 2) When there are too many detailed rules, invariably you'll have people get lost in them resulting in unintentionally illegal decks. Keep it as simple and as streamlined as possible.
Oversized Pick is OP but not in the way you think. I predict most decks will run little to no attacks and the ones that do won't be able to race Oversized Pick even with 3 damage added to all their attacks.