When your threat assessment was correct, but everyone else was content to follow the social contract, it can feel incredibly frustrating
The best use case with Kairyu-Shin is that its a Level 5 and can help access the K9 engine for K9-17 Ripper for a monster negate in the hand or GY, which can come up in most duels
The servo's body glows with blue aether, and it has a big eye-like globe to help us know that it's not just a gauntlet
Just casting Vampires rewards you with more Vampires, and you can go entire games without even needing to bring him out
You can carefully craft your draws with this broken black artifact, and a resolved Citadel is often enough to outright win with enough of a life buffer and some card filtration
Granted, Mirage was the very first time that Wizards tried using reminder text at all