Quest Mage is an archetype that came about with the introduction of Journey to Un’Goro, which gave us the card Open the Waygate.
This deck aims to stall the game long enough with its area-of-effect spells and removal until it has cast six generated spells from the likes of Babbling Book, Cabalist’s Tome, etc. until it can kill the opponent in one turn.
The combo used for the kill is two Sorcerer’s Apprentices and two Molten Reflections into Archmage Antonidas and infinite Fireballs. This allows you to defeat your opponent from up to around 150 or so life, as you only have a limited amount of time to cast all of the Fireballs.