you can't cast it without sacrificing a creature, and you can't sacrifice additional creatures
The flexibility of being able to choose a value for X is great because we might have an early-game case of wanting (or needing) to cast it for X of one or two, or we can wait until late-game and sweep a much bigger battlefield
(It cant be the target of spells or abilities your opponents control.) Illustrated by Adrin Rodrguez Prez Unreleased This card will be released on 2026-08-14, it is not legal in any format until its release date approaches

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Anyone whos won with a group hug deck before knows that theyre really just control decks
Of course, Dark Confidant is better known for its role as the backbone of Modern Jund decks, along with Tarmogoyf