Urza, Chief Artificer Probably the best affinity commander in the game, Urza, Chief Artificer focuses on curving out with cheap artifact creatures like Esper Sentinel, Ethersworn Canonist, and Master of Etherium to make Urza itself cheaper
theyre all kind of interchangeably good
Inner/outer sleeves - These are used for double- or triple-sleeving your decks
Timetwister is another juicy choice
Spending, essentially, four mana to exile your land, exile all graveyards, and pick up a Historic card before doing so, is an absolutely fantastic ability for a Utility land
Walk the Plank will be a universally used removal spell, of course, but I dont think it will be as good as many others believe