Diamond Valley is a little-mentioned member of the Reserved List, with just one printing back in 1993, and both its age and its obscurity make sales infrequent
That flexibility is the main reason Ugin is considered one of the best planeswalkers in MTG
They have lithe, feathery, serpentine bodies with the head of a bird, two legs, and two wings
Im not sure where Hive of the Eye Tyrant fits in either, but Im sure it could see play in some of the Black sacrifice decks with Shambling Ghast and Deadly Dispute
Brachydios and Nargacuga seem like the standouts here
Sure, this is a good swing late game card but it is so useless against so many lists and in the all important early game that it is a pretty bad option in anything bar a sideboard