Good game, won a run with every character. I am Groove Oracles #1 Hater.
Groove Oracle is not the weakest hero to play. Their x3 card is garbage at the start, but getting some Adrenaline and Overextends with some Midnight Oil to burn can work really well. You just need to get a bit of defense with cards like Butter Magic and Stoic and "heal 5, trash" so you can survive. And because of their inbuilt healing, anemic as it is, they need much less defense than most. Add some Planned Moves and some Asteroids and you have a good bid to win.