If you only use cards in a specific category, it won't be an advantage to be able to revive cards outside of that specific category, and it's easier to respond if the search is effective
Because of the incredible illustrations, they are wanted by many collectors across the globe
Once you're in the sacrifice route or mill route, this black card gives you time to stabilize, and Awakening Hall becomes your coup de grce once you get to 8 mana by mass-reanimating your whole yard
In the case of the former, its because the best choices vary not only by color identity, but often by specific deck building limitations: Seismic Assault and many other red effects want you to play an extra-high land count, while a black deck with reanimation and Tortured Existence obviously cares about discarding creatures
Even if you get rares worth a couple of bucks, the trade will almost always be detrimental
You can also double up on Gifts Ungiven with Azula, and grab a ton of pieces for the Breach combo while putting others in the graveyard
