Moving there does not qualify as a creature's demise, as the commander has already left the battlefield in some manner
Against decks like UW Control that are less likely to be able to damage a Phyrexian Negator, you can start hitting for five on Turn 2
Angel of Glorys Rise is known on the team for its sac outlet combos already (this card was highlighted on the BC brainstorm sessions regarding Trynn and Silvar combos combined with Fiend Hunter , and the precon is in the right colors to run Saffi Eriksdotter combo lines) but the Coven Counters deck wouldnt want to automatically build towards sacrifice based gameplay like Wilhelt would
Sephiroth and Aerith are both part of the main set for Magic: The Gathering Final Fantasy, rather than the Commander Precons, so they will show up in drafts and, possibly, Standard
It's an interesting effect that synergizes well with other "Ring tempts you" cards, but the most unique thing about Nazgl is that players can have up to nine cards named Nazgl in their deck
After that, it only works to be discarded