This is the core of the deck, and it's all Edge of Eternities
While Vandalblast often hits more targets, and is sometimes easier to cast, I like Spree for a number of reasons
Its a mix of removal and reanimation, and even in Standard, you can use this card with cheap 4-power creatures, like Monoist Sentry or Sunset Saboteur
Duskmantle Guildmage Duskmantle Guildmage is best known for going infinite with Mindcrank to mill your opponent to death, though it has other applications as a cheap, low-rarity infinite mana outlet or win condition for mill decks
You cant forget, too, the addition of Golgari (GB) lands from unfinished cycles
With a uniquely rare ability to completely shut down your opponents during your turn, Myrel stops all sorts of combat tricks from happening, giving you the freedom to safely cast your spells and attack into an open board