why no gideons?
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You have 6 mill cards in a mill deck. I'm sure you can think of some more
If you want a finisher in Mono Black, Grave Titan is there. A bit expensive, but it would certainly win the game for you
Lyzolda, the Blood Witch
Urborg is way too expensive. Spreading Seas gets the job done.
If you're going for the mill, add another Jace's Erasure and throw in cards like Treasure Hunt, Spreading Seas, cards that will give you more draw power.