It was obviously going to be great without needing to play it in any decks but having now had a decent amount of time using the card I can confidently say it is far better than I anticipated
Playing against Oko gives you a feeling of hopelessness, because you cant kill it (it regularly gets to ten loyalty in my games) and then it just neutralizes all your powerful cards
To date, our suckheads are Blood Tribute, Bloodghast, Gatekeeper of Malakir, Kalitas, Bloodchief of Ghet, Vampire Lacerator, Vampire Nighthawk
Retrigger Sephiroth's transform ability over and over to build up those emblems, before building up a board and sacrificing them all in one big burst of damage
They have flexible effects that I like having access to in a deck like Jeskai