A whole esports scene to qualify for in-game
While Oko has synergy with the deck, both in terms of having a lot of low-impact cards to upgrade to 3/3s and creating artifacts that become Mox Sapphire when Urzas on the battlefield, Urza strategies are extremely high-synergy and generally not looking to attack with 3/3s as a meaningful part of their gameplan
The point is that once it hits a certain threshold of usefulness, its not at all unprecedented for a rare from New Phyrexia to be $10, or even $15
Plus, opening up to black also doubles your chances of finding efficient beaters that fit into Oboshs odd-CMC requirement like Kederekt Parasite , Pestilent Spirit , and Syr Konrad the Grim
Sebastian Rosenauer This is a card I have little experience playing with myself, but I have sat on the other side of the table often enough to know how powerful the elemental can be