Im not a blue player, so I cant really say with any conviction that anyone needs Omniscience
I'm just glad that this isn't legendary because you can imagine the issues here
No cheating with Solemnity or stuff like that.
Later on in the game where a cheap small dork is weak and where an inability to block is far more relevant you at least have the option to make as a 1/1 which may sound awful but is correct surprisingly often and makes the card far far better than a straight 2/2 can't block would be
Oko comes down on turn three (often sooner, since green is the color of mana ramp), and if you don't have some way to dish out 6 damage right away, there's not much you can do to catch up
If you can afford to lose a Prize Point, you could even put Manaphy back into the Active Spot temporarily, allowing you to stack three Energy in one turn