I like Wring Flesh in that it's cheap, it's good for taking care of weak creatures in the early game, and in late game it allows me to kill off a larger creature with a weaker one. It's cheap and instant. As for the Obliterator, I feel it's rather situational, it really depends on which deck I'm up against, hence the reason I have them in the sideboard. Tezzeret's Gambit is a 4 cost sorcery, whereas Altar's Reap is a 2 cost instant, and since creatures will inevitably die, it allows me to deny my opponent lots of benefits by sacrificing a creature that would otherwise die from combat or spells. The Diregraf Ghouls is the same as with the Obliterator, I can easily swap them with the sideboard if need be, but I've found that swarming the opponent from the start with lots of cheap zombies is the most effective way to win with this deck.
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