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
Early game damage is just as important as late game damage, plus its recency makes it incredibly easy to get your hands on
You can just put them back on top of your library and grab them with your explore triggers from Hakbal
Pair it with the likes of Magmakin Artillerist or Marauding Mako (both also from this set) and you get an awful lot out of that three mana
Essentially, if it made you choose one or more options, regardless of card type, it made the cut so I could showcase the best flexible spells Magic has for you
Vampiric Tutor I am not a huge fan of Vampiric Tutor but only because I don't like having to play it