Sideboard Plan
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General vs. Aggro
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-4 Underworld Connections, -3 Thoughtseize (maybe -1 Thoughtseize)
+3 Lifebane Zombie, +2 Drown in Sorrow, +2 Devour Flesh (maybe +1 Doom Blade)
General vs. Control
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-4 Bile Blight, -2 Devour Flesh, -2 Pack Rat (or 2 Hero's Downfall, but prefer anti-planeswalker)
+2 Erebos, God of the Dead, +3 Duress, +3 Lifebane Zombie
If Orzhov and you suspect or know Blood Baron is there, leave in Devour Flesh, and bring in 2x more from Sideboard (taking our pack rat)
vs. Mirror
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-4 Hero's Downfall, -4 Desecration Demon
+2 Dark Betrayal, +2 Erebos, +3 Duress, +1 Devour Flesh
If Orzhov variant with Blood Barons, bring in the fourth Devour Flesh as well, and remove a Pack Rat.
vs. Monoblue Devotion
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-4 Underworld Connections, -2 Thoughtseize, -2 Desecration Demon or Pack Rat (on the Play vs. on the Draw)
+3 Lifebane Zombie, +2 Drown in Sorrow, +2 Devour Flesh, +1 Doom Blade
vs. UW Control
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-4 Bile Blight, -2 Devour Flesh, -2 Pack Rat (maybe -2 Heroes Downfall, but prefer anti-planeswalker)
+3 Duress, +2 Erebos, +3 Lifebane Zombie
If Blood Barons are there, leave in Devour Flesh, add the other 2x Devour Flesh, and remove some Pack Rat (or Heroes Downfall / Gray Merchant).
vs. GR Monsters
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+3 Lifebane Zombie, +2 Devour Flesh, +1 Doom Blade
-4 Underworld Connections, -2 Thoughtseize
vs. White Weenie / Monored Devotion
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+3 Lifebane Zombie, +2 Drown in Sorrow, +2 Devour Flesh, +1 Doom Blade
-4 Underworld Connections, -4 Thoughtseize
vs. RDW Burn
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+3 Duress, +3 Lifebane Zombie
-2 Devour Flesh, -4 Bile Blight
(May have Chandra why leaving in Heros Downfall over Bile Blight, even though they may have Young Pyromancer / Chandra's Pheonix)
vs. Rakdos Aggro
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(Split between creature aggro and burn/removal)
+3 Duress, +3 Lifebane Zombie, +2 Drown in Sorrow
-4 Underworld Connections, -2 Devour Flesh, -2 Heroes Downfall