Well you probably already ascertained that, but treasure and other passive mana generation is also a contributing factor Are we playing optimally or more relaxed: this one is huge, because if players have different expectations for the gameplay experience, this is what sparks debate about threat assessment Optimization: how lean is your curve, how many pet or none-staples are you running, and are you running many free effects How much of the chess clock does your turn take, relative to the other decks at the table The relative potency of your Commander That last one is super important, because decks that can rely on a four or less mana value Commander that generates card and/or mana advantage generally outperform decks that have a more vanilla Commander
Of course its always fun to own the first of something, but it also helps that this versions art is iconic, having been referenced in both Gifts Given and Realms Uncharted
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It helps load your graveyard, it helps bring things back from the graveyard, and it has a payoff for any card leaving the graveyard