Search your library for a creature card with mana value equal to 1 plus the sacrificed creatures mana value, put that card onto the battlefield with an additional +1/+1 counter on it, then shuffle
You can grind control decks out by saving up threats and learning to bait out counters, you can run anti-counterspell tech (from the long-forgotten Scragnoth to the debutante Lier, Disciple of the Drowned), and you can make them misplay by deploying cheap creatures before they get their shields up
I don't know, maybe I just convinced myself
But otherwise, I don't see it being too impactful
Alongside that, you can also give Skithiryx, the Blight Dragon haste for one Black mana, and regenerate it for two Black mana
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