The five-cost will swap all creatures in play with all in all graveyards - set that up and you just win
Honorable Mentions The more impactful spells, however, will damage each opponent, not just one of them
Theres no other mill support though (just Jidoor, Aristocratic Capital and Hope Estheim), and its absurdly slow to activate
However, while Sauron, the Necromancer benefits hugely from the Ring's temptation effect, this creature never actually causes the Ring to tempt the player, so it really needs the right deck to shine
Ultima destroying all artifacts is the ultimate nonbo with this card, so unfortunately you can't play this amazing wrath effect if your deck also relies on Pinnacle Starcage
Unless you have lots of shuffle or a particular synergy with the Brainstorm such as miracles you are usually better off with a more self contained effect