According to BGG the Dark Watch, Spite: Agent of Gloom, and Skinwalker Gloomweaver promos came out in December 2013 but the Vengeance expansion didn’t come out until 2014. Does that mean that there was a Dark Watch Setback promo card floating around long before there was a regular Setback card much less a Setback deck?
I dunno about “long” before (the fact that this entire game is only ten years old still weirds me out), but yes, when the Dark Watch promos came out, they included a hero named Setback who didn’t yet exist, as a tease for upcoming products. I still vividly remember getting my DW heroes - a huge upgrade for Expat and a seriously needed changing-up for the fairly boring MF, although Nightmist was mostly a downgrade, and when Setback was shown to all of us, it turned out that his promo is also pretty inferior to the standard power.
That’s funny, Setback was available before Vengeance in the digital version, too.
Vengeance was part of Season 2, but if you pre-purchased Season 2 you got three decks early: Setback, Chokepoint, and the Celestial Tribunal.