Remembering this acronym during your draft might help you make better decisions on what to pick and what not to
Even creatures that don't die from this effect will be severely nerfed and give you a significant advantage with just a 4/4 creature with menace.
Narrowing your option to a few hyper-specific cards, like 5-color artifact commanders, is a great way to bring up new deck ideas and get your creative juices flowing as you try to maximize the value of these commanders
Yes, theres sort of a limiting factor to how much you can draw with Necro in play, but life total is the most expendable resource in Commander, and card draw is one of the most useful
You end up in a bit of a bind with Phoenix where you want to build your deck with a little more learn to maximize recurring it, but you dont really want to max out on Phoenixes and draw multiples, but also your desired sideboard Lesson count varies a lot depending on whether you draw Retriever Phoenix in a game