even though that mana is restricted to casting your commander, its still the Commander equivalent of a Black Lotus, the most sought-after card in Magic history (well, except for The One Ring)
Its existence is so prevalent that the viability of anything with one Toughness is put into question
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Its exceedingly rare for a Commander deck to get a cycle of brand new cards, and I think they hit it out of the park with this one
The melded version isnt a human, but its tokens are bigger and its attack trigger can also be doubled, so why not
If you have any sacrifice outlet in play, such as Phyrexian Altar, you can then generate card advantage by sacrificing opposing creatures