Emet-Selch, Unsundered // Hades, Sorcerer of Eld was first released in the set Final Fantasy, illustrated by Nstor Ossandn Leal & Nstor Ossandn Leal
The powerful 3-cost damage cards Let The Storm Rage On and Strength of a Raging Fire were already in most Steel decks, and Belle made them that much better
The appeal to Gruul is thats a proactive deck featuring what I believe to be the best three and four drop creatures in Standard (Gruul Spellbreaker and Rekindling Phoenix)
Both Scrooge McDuck, Uncle Moneybags and Scrooge McDuck, Richest Duck in the World can help you play items for a discount or even for free, and if your opponent manages to destroy it, Gyro Gearloose, Gadget Expert can let you put it back on top of your deck to be played again
Even if Magda is not your Commander, and even if your deck is not focused around Dwarves, Magda is still strong enough in Commander decks that care about Treasures