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There is a real cost to playing this and so you should do so with some care

Black is one of the main engines in generating fast mana via Dark Ritual or Cabal Ritual, and black cards can cast spells from your graveyard all over again by using Yawgmoth's Will

The Collector Booster structure guarantees 911 traditional foil cards per pack, which is particularly attractive for commanders and signature cards you want foiled for the 99

And with being in black, you have ways of recurring that effect with cards like Malakir Rebirth // Malakir Mire

At the time of writing, they only have 58 decks on EDHREC, which is unsurprisingly low

Legendary Enchantment Radagast the Brown Whenever Radagast or another nontoken creature you control enters, look at the top X cards of your library, where X is that creature's mana value