These new cards are what are known as heroes (casually referred to in R&D as the flip cards)
I was talking about this style of deck in last weeks article: decks run by strange commanders, or that may be outside their archetypes usual colors
Popularity aside, there's no doubt that the first edition version commands a much higher value than the unlimited version
As such, the card is seeing fringe play in Legacy in Aluren as you are able to Venture and complete dungeons, especially Lost Mine of Phandelver
Emptying out your library should be turned into a benefit for you, and you have several options
The game is not about gaining as much lore as quickly as possible - its about maintaining a board state that, over time, gains 20 lore faster than your opponent