In Multiplayer formats it grabs something from each of your opponents, so not only do you take away their blockers, or similar, you then get multiple hasty annihilators for only 7 mana
In the article, "Bursting with Flavor," Mark Rosewater says, " Magic without flavor is simply not Magic ." When you look at the game, flavor and flavor text is just as important to the game as the rule text
Having resources at hand is crucial for the Deck, and it doesn't hurt to pressure the opponent to punish them for Special Summoning and searching cards
You could still win with storm using Crackling Spellslinger or Ignite Memories, but those werent in their list
Zekrom featuring N riding the Legendary pokemon soaring through the sky
Couple this with any kind of prison effect and youre almost casting an overloaded Spectacular Showdown