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Might be a little late here, but I though I'd mention Mayhem Devil for getting some ping damage off your myriad of sacrifices, and Mazirek, Kraul Death Priest for buffing up your few creatures to fairly insane levels after some sacrifices. Both work off of permanent sacrifice, and can potentially be game winners (or at least changers). Also nice against other Korvold players.
Brass's Bounty is also a really nice card to run with lands, tho a tad on the expensive side, but can net you huge amounts of mana and sac triggers.
As well, Killing Wave could be a fun board wipe to play with in the end game, especially when you have all those locus elemental tokens sitting around. Use something like 12 or more mana for it, just sac all your creatures but korvold, rake in all those +1/+1s, draws, and Locus Elemental damage pings, and then swing with korvold at someone. All Is Dust also provides a similar experience, but you lose korvold with it.