The Ur-Dragon feels like having a Sol Ring emblem sometimes, and the creature itself is a massive card advantage engine if it ever hits the board
If your opponent plays History of Benalia on turn 3 and your turn 3 is going to be a Tajic, its going to be difficult to attack and trade profitably
This is especially good in or against decks that lean on tokens, as you can easily target a specific type of problem without necessarily having to set yourself back in the process
You can, however, pay any additional costs
Its so popular, its actually become one of the companys newest focuses with entire sets dedicated to it, and a fresh set of decks with each new set
What if we called one end of the spectrum rare and considered a new rarity for the other end