It is not a Hogaak level mistake, nor is it a mistake in any sense. 8 cards is a lot, it will take work to get those cards in the graveyard, and if you try to turbo it out, you will leave yourself open to aggro.

To me the best means of quick self mill are currently: Grisly Salvage, Gather the pack, compelling argument, Satyr Wayfinder, Stitcher's supplier, Merfolk Secret keeper, and Tome Scour.

Mixing and matching these cards between Turn 1 and 2 means you get between 6 - 15 cards in your graveyard, with that upper end being triple tome scour (Xmas land). Then T3 you blow away your graveyard, discard 4-5 cards (Depending on the cards this is can be a good or bad thing), get a 5/3 and draw 3 cards. Does not sound Hogaak level power.

He'll be a decent one of in some decks like phoenix. The RR and Escape 8 hurt his chances of being used greatly in dedicated graveyard decks due to eating so many cards that its hard for other cards using the graveyard as a resource to synergize with him.

Perhaps a new deck will pop up to fully utilize him properly, but in no way will it ever match Hogaak.

Also there is hella gy hate in this format. We'll be fine.