If you are offered the Discovery cards and draft them, you win. If you aren't offered them, you lose. It's too easy to discover into discover into discover. Suddenly you have a handful of overpowered cards and just win. That stupid 4/8 taunt dragon that discovers another dragon offers another 4/8 taunt dragon like 80% of the time.. watched my opponent just play it 4 times consecutively. How ridiculous.
True. Some adjustments could be made. I just fought a mage that discovered into discover a dragon 5 times in a row. And that spellpower on the discover drgaons is very powerful as well if you get it to stack.