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A second important change involves how Threshold decks are counted; in the last year the archetype has evolved to the point that the old categorisation by their splash colour (or lack thereof) makes little sense.
Today, the one clear split is between decks packing the maindeck Counterbalance/Top combination and those favouring an aggressive, tempo-driver approach with Daze, Stifle, and Wasteland. The latter decks are quite well established, with only a few secondary choices being discussed (mostly additional threats such as Dreadnought or Alara Reborn creatures) and splashing exclusively either Red or Black.
Counterbalance decks, on the other side, exist in a continuum, from the classic Mongoose builds to the Chicago lists to those incorporating additional tricks (Survival, Natural Order, etc.); they also exist in pretty much every possible colour combination that includes Blue and Green, from two to four colours.
If some clear division in approaches emerges, this will eventually be adopted in both thread organisation and tournament tallies. For the time being, all CounterTop decks that do not fall into any established category, i.e. that follow the game plan of "establish the Balance soft-lock and play good creatures", will get dumped into one format-leading cauldron.