cards like training grounds mtg Agatha of the Vile Cauldron (foil) - Wilds of Eldraine and conquest Training Grounds (Card) | EDHREC

Its all-around great value with this one

Dryad Militant basically eats any spell that goes to the graveyard from anywhere, which helps slow down Faithless Looting, Snapcaster Mage, and even Delve decks by giving our opponent fewer cards in the graveyard to delve away

Ruthless Technomancer is a nice companion card if you enjoy noodling around in the graveyard, and though Revel in Riches and Black Market are hugely popular, they paint a massive target on your back and often end up less impactful than curving out with a creature and keeping on the pressure

While cEDH primers tend to be quite long, they dont have to be the same for casual decks