All of this is to say that Oko is extremely hard to answer in combat, so it largely requires a spell to deal with it (or, as we see in Throne of Eldraine Standard, you can go way over the top of its threat generation by, for example, making lots of 2/2s with Field of the Dead)
The striking yellow background and the totally alive cowboy make this card one of the most distinctive of any Elesh Norn card, and it is a treat
To improve the mana base, Id add Shambling Vent, Fetid Heath, and Vault of Champions, replacing three basic Plains
I hope that my advice helps you make sound purchases
The friction is the crypto layer, which feels smooth once configured but daunting on day one, and a handful of users report checkout hiccups
If its a vintage card and it's less than $40, or if its a liquid card like Pikachu then it could be a small profit