While Vandalblast often hits more targets, and is sometimes easier to cast, I like Spree for a number of reasons
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
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
Triple is enough to kill someone who has already taken a hit from Lightning most of the time, so getting double that in an extra combat just ends people
even if it swings in and copies just a mana rock every turn, youre still getting permanent mana advantage until the token is removed