Ravenous Trap is a great trick to spring on your opponent if theyre doing some graveyard shenanigans
Dark Ritual allows you to take advantage of drawing multiple cards a turn back during the black summer of Magic , it wasn't unusual to see a player drawing 4-5 cards a turn every turn of the game using Necropotence to fuel their crazed game of "holy cow, is this for real?" No other card in Magic has allowed a player to draw so many cards turn after turn so cheaply
This is a great way to soft-counter our opponents removal spells and protect our Umbris
Sire of Seven Deaths is magnificent
Early in the game, you can pay a red and a black to force an opponent to discard a card
Sadly, this is less relevant for a card like Aurelia, Exemplar of Justice, or many other less impressive four drop creaturestheyre simply unimpressive on later turns, and quickly outclassed by better cards