It's also the single hardest Gengar to price honestly: sales this year have ranged from double digits to over $900 depending on venue, condition, and (frankly) whether the listing was labeled correctly, since LC reverses get confused with the plain holo constantly
The fact that its also an artifact itself adds even more synergy with cards that care about artifact count
Thoughtcast is a simple, efficient sorcery that draws two cards, while Thought Monitor gives you the same effect but adds a 2/2 flying body to the board
It's typically pretty difficult for red to remove permanents besides artifacts and creatures, so anything that offers a widers pool of potential targets is rad
Fun fact: Klinklang's gears are so precise, they can keep time better than a clock
And the M21 regular Fiery Emancipation version is worth around $22