Two cards in the deck are Legendary Creature commanders with Traditional Foil artwork
All you need is to survive one more of your opponents attacks so that you can untap and cast your game-winning spell
Olivia's Attendants is an expensive card, costing a whopping six mana unless you have Strefan and two Blood tokens already available, and then they can be dropped onto the battlefield super-fast

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Aboleth Spawn lets you copy an opponents Dockside Extortionist trigger, and because of Active-Player/Non-active-Player ordering, your trigger will then resolve first, so youre free to try and win in someone elses turn
In addition to this, a big part of the reason these cards were so popular was because the mana in that Standard format was quite bad, to the extent that you were pretty close to wanting Attune with Aether in your decks even before the energy bonus, but once you have the energy bonus you might as well play Harnessed Lightning, which means you may as well play Rogue Refiner to power up your kill spell, and so on