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Black mana offers lots of sacrifice outlets for both the caster and other players, such as Fleshbag Marauder, Plaguecrafter, Smallpox, and Village Rites, among others
Skittering Cicada has similar utility but instead of slowly evolving, it gets trample and +X/+X where X is the mana value of the spell we cast, so it can become a huge threat from out of nowhere
If theres any difference in size between the two cards, its pretty safe to say that the card in question is fake, though its not a guarantee
They are produced by Wizards of the Coast exclusively for the artist in very limited numbersonce they're gone, they're gone forever
Other than including Phyrexian and artifact creatures, its not immediately obvious how to build around him