It appears on first sight that the Signature Dream Defenders Mega Bundle contains the other 4 smaller Imbue Class Bundles (Druid, Shaman, Hunter, and Mage).
But on closer inspection, the Mega bundle is specifically missing the neutral Bitterbloom Knight and Flutterwing Guardian signature cards. So, to collect the whole set, I have to buy the Mega Bundle + only the Druid bundle (but not the other class bundles).
Is this intended? or an oversight? It appeared to be a weird way to structure the bundles.
UPDATE: I am now convinced that it’s an oversight, because as it stands, it is actually cheaper to buy the four smaller bundles individually then to buy the mega bundle (if you are trying to collect all the signature and don’t count the card packs).