The biggest weakness of the deck is its over-reliance on Squall

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Love them or hate them, lands-matter decks are pretty popular at Commander tables
On top of that, its a closed loop, so to speak
Savra, Queen of the Golgari cares about when you sacrifice black and/or green creatures, so Pest tokens that gain life when they die are the perfect sacrifice fodder to get the most out of Savras abilities
Second thought is what kind of real tomfoolery can we get up to by activating Memnarchs second ability (and copying that with Lithoform Engine!)