You wont always need a board wipe, so you can always cast it for one of the cheaper modes if theres a problem that needs to be dealt with, but I definitely dont mind destroying all tapped creatures for six mana at instant speed
Since the Final Fantasy decks are pretty new, anyone who hasn't been testing them ahead of time online through unofficial channels like Tabletop Simulator or Cockatrice likely hasn't gotten a good idea of how well each deck plays just yet
This card doesnt carry as much flavor as Gilgamesh, for example, but its gameplay effects are remarkable
Other cards may care about which lands are Towns.
Transport Pod also makes other less-played Locations viable, now and in the future
Force of Negation as a three-of in the sideboard is for similar reasons, as I want to be ready to have at least a semblance of chance against decks like the Neoform deck, given that well have to deal with it for some time until it naturally bans itself out of the format