Does anyone have any thoughts on using Strip Mine and Wastelands to handle the Shop?
While destroying Mishra's Workshop is a good goal, it costs you too much in land drops against a deck that's bottlenecking your mana with Spheres and the like. Workshop decks often run Crucible of Worlds, as well.
Has anyone else thought about splashing white and boarding in 4x Serenity?
Serenity 1W
At the beginning of your upkeep, destroy all artifacts and enchantments. They can't be regenerated.
I feel like with a few Tundras, this could own Workshop, and this would also work pretty well against Oath.
I was planning to use it as part of a Bob Tendrils SB.
For the same reason Wasteland and Strip Mine aren't ideal plans for a combo player, Serenity has always had a tendency to bottleneck my mana. I often just play out my Moxes against Workshops so I have workable mana. If I play an early Serenity, Workshop players don't play more artifacts into it, obviously. If they don't play into it and I can't win on the spot when my Serenity trigger resolves, they play out their hand and I'm back in my original predicament. If I play out my Moxes to have sufficient mana to maneuver and drop the Serenity when they've committed more to the board, I lose my Moxes and a lot of my mana making it harder to leverage the "open window" into an explosive bomb. I guess what I'm saying is Serenity requires me to have an ideal hand of explosive mana in hand (Rituals), ample mana on board (Lands and Moxes) and a bomb (usually not a tutor). I don't think tutors are that great against Workshops because they take too much setup when Spheres makes them cost more and you can't play more than one spell a turn. If you're depending on tutors to find a bomb, you need more mana. I've found the best solutions to Workshops are cards that don't set you back in the most important resource in the matchup, mana. Cards like Hurkyl's Recall are amazing because they Wrath the board at instant speed and don't set you behind in mana. In conclusion, I would consider playing Serenity in old-style Long builds like Grim Long but not decks like TPS or Bob Tendrils. TPS and Bob Tendrils usually skimp on Ritual mana, only including one copy of Cabal Ritual, and don't play as many bombs as Grim Long.