Feasting Troll King does just that, letting you cast a monstrous 7/6 vigilant trampler for free if you have three Foods to sacrifice, and the King himself is in your graveyard
But even with those two brakes, that's nasty on a one drop even without pumping its power, since they cannot counter it with Swan Song or An Offer You Can't Refuse since it's a dork and artifact
Add warp to the mix, and youve got a repeatable engine that piles on advantage while it flies over the battlefield
Furthermore there are plenty of other legendary commanders you could use in the deck itself but Hackbal seems untouchable for how the deck is structured
Now to adjust the decklist so that I can give it trample
While some commanders pay you off for sacrificing other permanents, like artifacts and sagas, this list focuses on sacrificing creatures