Let's say that you are playing Archenemy. Scheme decks are not shuffled, so after enough turns, you may know that the solo player's next scheme will be Ignite the Cloneforge! If you can somehow get rid of all of your permanents other than Phage the Untouchable before your opponent's precombat main phase and all of your teammates concede, then... (Note that Cleansing won't help, since your opponent can protect your lands from being destroyed by paying life (if they have enough); it doesn't say you can pay life only to protect your own lands.)