The fans of blue control are probably very excited about this card
While the one mana instant is certainly very powerful and flexible, especially in the current ETB-heavy metagame, it does nothing on its own
Even if the opponent has Leyline of the Void or Rest in Peace that you dont have another answer for, Oko can turn your one- and zero-power creatures into 3/3s, giving your backdoor plan of attacking with horrible creatures some real teeth, especially against an opponent who maybe took too many mulligans to find a hate card
Thankfully the deck has one secret weapon against opposing forces in the air: Thundermaw HellkiteThundermaw Hellkite
Thanks to this, playing them over and over again seems like a great idea
Everyone who plays top-tier red decks like Creativity or Scam in Modern has four Fables, because (as shown by Tarmogoyf), Magic: The Gathering players are used to spending loads of money on competitive staples