you cannot cast it without sacrificing a creature, and you cannot sacrifice additional creatures
Ironically, for this combo to work, your commander cant be on the battlefield unless you have some other way to place at least three other cards into your graveyard for each time you recast Burning Inquiry
It's a prominent tool in Lotus Field combo decks in the format where it usually fetches the decks wincons Approach of the Second Sun or Omniscience
Everyones list will be published, in order to minimize the advantage bigger testing teams used to get by watching lots of matches, recording data, and feeding it to others on their team
Magic has a lot of big creatures: Krakens, Colossi, Dragons, Dinosaurs, Wurms, Eldrazi, and the list goes on
You can't try to attach an Aura or Equipment to a creature if that Aura or Equipment can't legally be attached to it