I was getting in more 1v1 commander games so it's a bit more geared towards dueling, as opposed to brawling in a multiplayer setting, but I made efforts to try to reduce how much mana I had to invest into Jenara to ramp up her damage
Take out your earbuds, stop chatting with that friend you brought with you, and greet your opponent
Haldan lets you cast noncreature spells from exile that have fetch counters on them, and you can spend any kind of mana to cast them
This is like the ongoing Collective Defiance, you get to grind down the control players by attacking their hand or gain tempo against the aggressive players by killing their dorks and absorbing attacks with loyalty rather than life
That may not sound like enough recent play to cause such a significant price spike, but in fact Kill Switch is only found in 1,244 EDHREC decks total, so demand for the card must have more than doubled in a very short span of time