Its advantage: the White Knight survived a single shot of Serrated Arrows
Starting life as simply a zany one-off encounter in the massive Waterdeep: Dungeon of the Mad Mage mega-adventure, Captain Nghathrod gave WotC designer Ken Nagle a memorable, tentacled face for a classic glue two themes together Commander card
In an attempt to raise the level of tribal cards in the environment, the development team changed the sacrifice to allow any of that cards creature type to be sacrificed
Wizards tried to stop this deck initially with an emergency ban on Bridge from Below, but this just forced the deck to become more streamlined and allowed Hogaak to be cast on turn two 60% of the time
But "unpopular" doesn't mean "bad," and Iname proved to be a powerhouse when built correctly, which is to cast Iname, dump a lethal amount of spirits into the graveyard, and then mass reanimate them to win