This was the only land I decided to add to the list under those criteria
Be sure to check out IGNs existing coverage of the new day-night cycle as well as new mechanics like Disturb, Decayed and Coven
The secret is its Eminence ability, which reduces the cost of your other Dragon spells by one mana, even while The Ur-Dragon is in the command zone
This commander doesn't do much else, though, which makes it an optimal commander for weenie or specific combo decks, but weak for anything else
Don't ever feel like you are scamming someone if they are okay with taking a loss that they are fully aware of
Some of it is no doubt due to homogenization and tools like EDHRec, some to the expansive and varied content created by the excellent community, and some to the natural evolution of playgroups and card pools over time