Every 1,000 XP nets you one Mastery level on the Mastery track, and each level has the possibility for extra goodies
Dark Confidant will provide beat downs, card advantage, and accelerate life loss so Cecil can transform quicker
...but just identifying the cards that make for obvious routes to card advantage is not what differentiates good Magic players
Cards that havent been reprinted in quite some time like Sygg, River Cutthroat and Oona, Queen of the Fae are clear standouts covering the majority of the decks value to begin with but cards such as Notorious Throng, Obelisk of Urd and the standard combination of Sol Ring plus Arcane Signet all drive this decks value through the rough before you include what is likely to be a new favourite Commander for many players supporting a Blue/Black creature-based strategy
Dragon Appeasement doesnt even give you a way to sacrifice anything
This basically ensures that, once Electro leaves the battlefield, hell take something else with him with all your extra mana