As you might expect, Oko's one of the folks who is wanted, but Oko's poster is twice as scarce as the other wanted poster mythic rares
That means you can cast and recast him over and over again to trigger Equilibrium or things like Aura Shards, bounce something about to be killed or after chump blocking, Tap-Lock with Opposition, bounce a creature with an enters ability like Mystic Snake, or to surprise block and kill an attacker too
Players have called this "mill," named after the card Millstone, and this term has now been promoted to an official game term
Also, unlike previous scoring cards, this has a huge target on its back by those with big ground pounders like Token decks or Simic Landfall
This creates a brutal life tax that forces opponents to expend their health just to interact with your board