Unlike Rachel, Jimmy, and Josh at The Command Zone podcast, I dont really consider Innistrad: Double Feature a set in its own right, since it was just putting Midnight Hunt and Crimson Vow together in a Draft environment
Even with several similar effects already out there, Kitsunes Technique is the lowest cost when Sneaking and is the only one to round up instead of down without being tied to an additional cost or being on a creature
The tricky thing about this card is timing: having to pay two mana before casting an impactful spell could throw off your mana curve if you're not careful, making this one you'd be better off holding until the late game than casting as soon as you have enough to warp
There are a lot of go wide options available in CMM and Silent Arbiter is here to stop all of those
All things considered, knowing what is in your opponents hand is very useful information, however, the real value lies in your ability to take away their best creature, and turn it into Valki later