They don't generally do anything different to the standard version of the card - a promotional Pikachu and a regular Pikachu have the same effect in battle - but they have a different appearance, artwork, and depending on who you talk to, a certain amount of prestige
Theres also a reasonable amount of lifegain available to help you stabilize after a bad start
Final Fantasy May 1, 2025 Final Fantasy Commander Deck Techs May 13, 2025 Final Fantasy Set Reviews Vivi Ornitier 37,204decks Kefka, Court Mage 28,746decks Sephiroth, Fabled SOLDIER 28,209decks Kuja, Genome Sorcerer 20,255decks The Wandering Minstrel 18,837decks Choco, Seeker of Paradise 18,692decks Terra, Magical Adept 18,280decks Hope Estheim 16,924decks Tifa Lockhart 14,216decks Lightning, Army of One 13,690decks Golbez, Crystal Collector 11,541decks Noctis, Prince of Lucis 8,518decks Cloud, Midgar Mercenary 7,843decks Squall, SeeD Mercenary 7,302decks Ultima, Origin of Oblivion 7,200decks Clive, Ifrit's Dominant 6,861decks Jenova, Ancient Calamity 6,595decks Sin, Spira's Punishment 5,995decks The Emperor of Palamecia 5,860decks Yuna, Hope of Spira 4,973decks Vincent Valentine 4,787decks Black Waltz No
Board complexity is about understanding how that card interacts with all the other cards
This artifact creature can be a combo-crazy commander with tap and untap artifacts, you can slot it alongside commanders that already do this sort of thing, like Trazyn the Infinite, or you can use it to reuse Agatha's Soul Cauldron