Creatures with shadow cannot be blocked except by creatures with shadow, and cannot block other creatures unless they have shadow, which fits given the nature of the Unseen world in Lord of the Rings
This card is pivotal for decks that discard several cards, making it a phenomenal set-up tool for those strategies
Since both of these cards are black, you'll definitely want Inalla, Archmage Ritualist as your commander, but in a deck built around Wizard enters-the-battlefield triggers, you can never have too many Panharmonicon effects, making Naban, Dean of Iteration a great support card in the 99
For example, Fabled Passage is another fetchland that can only grab basic lands, but it's much better since there's at least a chance the land could enter untapped
BPhillipYork: Well exerting a land is new thing, interesting idea
Since it was its own sheet, if you got a rare or mythic rare double-faced card, you'd also get a rare or mythic rare single-faced card in the booster