Archfiend of the Dross had a bit of a Fading feel to it--the presence of Proliferate in Phyrexia: All Will Be One meant you could keep the Archfiend around, or you could just try to race your opponent
From OP04 onwards, they were removed from packs this is why Japanese booster boxes after OP03 are physically smaller than earlier sets
That said, lets briefly go over these and why they are important to building a commander deck
Its a nice energy generator and payoff for two mana
Another border color for UB cards was dismissed because Wizards of the Coast feared that the UB sets wouldn't get treated as "this is a different subset of Magic ", but rather as "this isnt a real Magic card", as silver-bordered cards sometimes are
While a solid threat against midrange, Inventor was decidedly terrible against decks that don't pack Terminates in the first place