rylla
For me the Illuminated (Carol H). I like to use different decks but the deck I am always coming back to is the Illuminated.
Right now, just the Wild Unknown. I define "workhorse" as a deck that has high stamina and good readability, while also being reliable to me and generally agreeable to other querents. I've had the WU for over a year while most of my other decks are half at most, so it'll take me a while to see which of my newer decks will fit the bill.
The Fountain