Its activated ability digs through an opponents library until it hits an instant, sorcery, or creature, and then it lets you cast that card for free
While exiling your own creature is generally frowned upon, youll be gaining yourself 10,000 life, which is a huge amount in any game
Milling your opponent is actually positive for them unless you can finish them off, and there simply isnt enough lifegain to enable Hope as a potential win condition
Trading card items are excluded from exchange when opened or will not be refunded when opened
Remember, I am not saying these cards are bad or will not see play in other archetypes, they are just not slam dunk includes for over 1/5 of the metagame, in full playsets, for every player running a certain deck
I'll also make one Can't-Miss pick, which is my surest selection of the set