MOMENTUM
For two players.
At the end of each turn except the first players' turn, players count their current levels. If one player has more, they get the Flag. If they already had the Flag, instead they get a point. The first player to 3 points wins. (The Flag is not a card or object; nothing in the game can interact with it.)
This Scenario is another battle for Levels, but it makes sure that "fast" decks can be beaten without simply destroying the object that's scoring them points. It incentivises knowing when to use your short bursts of points and evaluating which player will win a very long game. Generally, cards that are fun or interesting in Threshold will also be so in Momentum.
Be warned that games in Momentum might go long, as the Flag sloshes back and forth-- they might even come down to which player runs out of cards in their deck first! At the same time, they might also be decisive battles where players win without using all their potential tools. If you favor a particular game speed, you might like other Scenarios better. If you're open to a mix of slow and fasts games, you enjoy analyzing who's winning, and you like it when every card is an interactive tool instead of just those that say "damage", you'll probably love it!
LIMIT PARTY
For two players.
At the beginning of each player's turn, their opponent names a very high number, like a trillion trillion. At the end of that turn, if the active player has at least that many levels, they win the game.
This is essentially "first to do an infinite combo wins"! You'll want to build decks accordingly-- your Threshold or Momentum deck might not even have an infinite combo, in which case you can't win! In practice, you don't even have to name the numbers-- just the easiest way to define "infinite combo" is "bigger than whatever really big number you name, no matter what".