It provides a way for you to sacrifice creatures and also a way to profit from said sacrifice while protecting Rakdos from removal

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They all give you access to more, and hopefully better resources
I could have also decided to play a ramp deck instead
While eight mana can be a bit unwieldy, eight energy to grab it out of the graveyard for a turn for an alpha strike is easy to arrange, and will have huge results if you've got a developed board