Scavenger Grounds Graveyard hate is criminally underrated in Commander, but the fact is that there's just as many scary graveyard shenanigans happening at tables as there are scary enchantments/artifacts, and you need answers to deal with them
Although the card has been around for a while, it was only with the release of Modern Horizons 2 that the deck became competitive, as Fire // Ice and Shardless Agent were both big additions to the deck
She also gains a +1/+1 counter every time you draw a card
Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand
Also I would include all of the spikes (Spike Colony Spike Worker, Spike Drone etc.) I would also check out the tier list and the discord where you can get some really useful deck help
The Zimone, Mystery Unraveler uses Landfall to trigger Manifest Dread, making it the other main mechanic within the Duskmourn Precon