If youre not going to go straight for the jugular like that, then which cards you choose to give to opponents depends on what your commander incentivizes (and how mean you feel like being)
Sounds awful, and that is because it is
I think it's a bit low power level wise, 6 of the 9 cards you're shuffling in are mana sources after all, and you still need to draw them, but the coolness factor may override you here
It was completely usurped by the dog creature type for the sake of consistency, and to give the hot-off-the-presses Rin and Seri, Inseparable more options
Archon of Cruelty quickly found a home in Legacy reanimator decks, where you can use cards like Entomb to put it from your library into your graveyard, and then bring it back in the same turn with Reanimate
It also helps to insulate against counterspells, as opponents will have to counter both copies to prevent you from getting the search effect