MAGIC: THE GATHERING
Add to your mana pool.
This classic mana acceleration spell has been around since the beginning of the game. Dark Ritual into Hypnotic Specter remains one of the most powerful turn ones you'll see at the kitchen table. Dark Ritual also gets played in high powered combo decks like Storm, that try to play a barrage of spells on a single critical turn before casting Tendrils of Agony.