Tormod's Crypt and Nihil Spellbomb both make good choices for a storm deck.
Yayy I have received the backup from Morg! I feel
justified!
Relic of Progenitus is usually a good choice, but with Kess, Dissident Mage you want to avoid exiling your own graveyard.
That's a solid point. I missed that they were running Kess as their commander (don't ask me how, I don't know) and that Relic hits your own graveyard. Scratch that one.
Mind telling us what deck it is that you need the grave hate for? We might be able to provide some better, more specific hate cards for that strat. I would start out with
Tormod's Crypt, as it is instant speed & dirt cheap both mana wise and $$ wise. If you are still encountering graveyard problems even with the Crypt, then consider including Spellbomb.
I only have a few other things to add onto Morg:
Thought Scour: I think this card is perfectly fine, especially in Kess. If your opponent plays a
Vampiric Tutor,
Enlightened Tutor, etc. you can yeet that poor card right into the grave and draw your own card for just 1 mana. Alternatively, you can mill yourself for 2 and give yourself a few more options with Kess, give a little more fodder for
Underworld Breach, or get rid of the 2 cards you put back on top with
Brainstorm. Now that I think about it, it's really good with
Underworld Breach, wow. Imo, it's a really good card here.
Ad Nauseam: While it is on the expensive side ($14), It is fantastic in low to the ground storm decks such as yours. I definitely think
Consecrated Sphinx out for
Ad Nauseam will show a major performance difference, especially considering you can find Ad Naus with
Mystical Tutor, unlike Sphinx.
Hmm, I think that's about it from me. Morganator pretty much said everything I wanted to say much more elegantly than I would've said it.