This is my take on a RDW. I feel that vexing devil has more utility and can bring more to a field than a Rakdos Cackler can, and that burning-tree emissary with lightning mauler is a stronger main deck combo than the ash zealot with lightning mauler or ash with burning-tree. I replaced pillar of flame with mugging as it seems to fit the style of RDW much better.

As for sideboard, legion loyalist shuts down any token decks. Zealous conscripts is always a strong choice as a counter aggro/big creature deck. Rest in peace, ash zealots, pillar of flame, and skullcrack all counter reanimator and can be switched in and out of the deck easily. Skullcrack also is strong against orzhov and other lifegain setups.