I haven't played any of the cards yet, I'm still trying to decide which ones I want' to level up (which means buying lots of copies). Problem with packs is you never know what you'll get. I opened several packs and no epic or legendary cards came my way unfortunately!
Yeah it's all up in the air right now. Some of the new cards are sweeping the floor with those not upgraded. Sorry to hear you didn't get the legendary yet! I didn't either, but will hopefully get one soon!
Let's cross our fingers!