You can pull off various combo shenanigans in Urza, Lord High Artificer and Emry, Lurker of the Loch decks, especially when coupled with a card like Mirran Spy
9: Search your library for any number of Dragon creature cards, put them onto the battlefield, then shuffle
Lurrus shines in low-to-the-ground decks with lots of 1- and 2-mana cards, usually aura decks in Historic
Nemata, Grove Guardian, while expensive for a commander, also has the potential to be a huge threat at any point beyond the midgame as both token generator and payoff
The Resolute Archangel trigger will do nothing, because setting the amount of life to a specific value also leads to life changes that are forbidden