Just like in Standard, a resolved Ugin is lights-out for most of the Historic metagame
You want to use it after you've mostly used your searches and recruits so you don't banish necessary cards face-down, but since Junola is mainly needed for turning the game around, you can't really be that picky
They're rather aesthetically pleasing with a reflective foil and unique borderless artwork, thus making them the most sought-after rarity cards
Numa, Joraga Chieftain adds the ability to pump her up so she can deal more damage and make even more Saprolings
On the other hand, the Charizard Gold Star hasn't had recent sales, so it cannot feature among the best cards from this era until a market price is re-established
(2019-11-12) If any game actions involve randomizing a portion of the library, randomize it again to undo that action