Underworld Breach is literally a story right out of Urzas Saga block
Youre probably hearing it right now in your sleep
But it can also become a pretty good source of removal and interaction
Esior provides protection and evasion in the command zone, while Ardenn gives you utility and cost reduction by effectively removing equip costs
3 Drannith Magistrate This is one of Commander's most controversial cards, and there is a reasonable chance it could become banned at some point in the future
If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play