It is a special format that is multiplayer, intended to play with four or more people (though can be played with more or fewer players)
It already has three great combat abilities, so you can just go with the buffs and triggers, like Sword of Fire and Ice
which include Alaska time, Central time, Eastern time, Hawaii-Aleutian time, Mountain time, and Pacific time
You cant afford to let it go too far
are all very powerful archtypes in Nick's cube atm and that would be a very powerful option against them, but not a card that was really correct to maindeck enough to be auto include, hence a great sideboard card, but one that's flexible enough to get played enough to justify its slot unlike something like the Blasts or Chill or Boil etc