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Your growing life and value engines can make you a target , so it's a good idea to include a bunch of removal and protection effects

8 Island 8 Mountain 8 Swamp Abaddon the Despoiler Aspiring Champion Assault Suit Barren Moor Be'lakor, the Dark Master Bile Blight Bituminous Blast Blasphemous Act Blight Grenade Blood for the Blood God

My first deck ever was a mono-black lifegain deck with pieces like Zulaport Cutthroat, Xathrid Necromancer, and Necropolis Regent

Second, Carnival works with any creature, including tokens, which can allow you to snowball into a lot of mana very quickly with commanders like Ghave, Guru of Spores or Teysa Karlov