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Just play as fast as possible and kill what gets in the way. This has played great for me at FNMs lately. Essence Harvest is surprisingly good with Lashwrithes. Vault Skirge/Vampire Nighthawk + Lashwrithe is also pretty great. Perilous Myr in the sideboard because its really the only thing mono black has that comes close to an answer to Mirran Crusader or other pro black.
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