I've crafted Valeera the Hollow, and use her with Lich King, Plague Scientist and Shadowcasters, and I've gotten so much value it's unreal. When you have two Lich Kings on the board and get 2 Death Coils to use as heals it can swing a game. Had some really fun games with her. Still have 8650 dust left so I may craft Jaina, Gul'dan and Rexxar. Rexxar seems to be high on the fun factor if not taking the game too seriously.
And it's always a chuckle worthy moment when a Pirate Warrior player tries to click on your face when you're stealthed..............
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Dammit Bernard !
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https://www.reddit.com/r/JUGPRDT/comments/5wijai/prerelease_card_reveal_order/
This was the Ungoro reveal dates; I would expect a reveal similar to this up until the expansion release.