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
Great for TCGs like Lorcana, MTG, Pokmon, & Flesh and Blood
If I told you the blue player got free instants or sorceries, would you say they stand a good a chance
The other exception is known but rare these days: when my opponent has one specific haymaker I need to interact with, I might hold discard until just before they can cast it
Making your opponent say things will often be reward enough. Mise This card proved very tricky
Can I get Cloud of Faeries or Temporal Fissure