Most of them are little more than glorified scavenge - a mechanic that famously doesn't do much in this format to the point that not even Slitherhead did anything
Having reach, trample, and protection against multicolor means that the card can be a brick wall to many threats in many different formats
The few times Magics slipped up here, player mistakes abound
For this combo to work, we need our commander, Intruder Alarm, a Room that makes a creature when we unlock it (Grand Entryway // Elegant Rotunda, Smoky Lounge // Misty Salon, Unholy Annex // Ritual Chamber, Spiked Corridor // Torture Pit, Dollmakers Shop // Porcelain Gallery or my favorite Mirror Room // Fractured Realm), and an untapper (Kioras Follower, Vizier of Tumbling Sands, or Kelpie Guide)
As hobbies turn into investments, authentication services in categories of high value have become a priority for collectors