Essentially a hastened Rummaging Goblin, you get access to madness costs on your spells with very little effort, with the main upside being that you will have a dedicated way to fill your graveyard with cards that want to be there, right from the command zone
While you control Hades, Sorcerer of Eld, abilities that trigger whenever a permanent you own is put into your graveyard from the battlefield (for example, "When this creature dies
Ironically, Erebos is another card that has Yawgmoth's Bargain vibes, this time letting you draw cards for life, which is an extremely common Black proposition
Spellskite sees varying amounts of play in multiple formats, and Hunted Horror is pretty cool in Commander since it sets up political deals
Sol Ring, though, was an uncommon artifact, so there were a handful of them floating around the group and whoever had one or two could toss them in any deck
It was a deliberate look back on and tribute to the game itself, narratively justified as time unraveling within the plane of Dominaria