Thankfully, I have a good reason: we've got a Conspiracy spoiler to show off for you all
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
One utility land I always include in my decks, if my commander is three colors or less, is War Room
This five-mana red and white planeswalker comes in with four loyalty, can create 3/2 spirit tokens, allows you to Discover with a value of four - which means you can cast the next nonland card in your library with a mana value of four or less for free - and lets you exile cards from your graveyard to gain mana, then cast those cards if you want to
Honorable Mention Emberwilde Captain Emberwilde Captain is a strong, aggressive threat stapled with card advantage
This can be an especially good card in a spellslinger deck that isnt running too many powerful creatures, since you wont have to worry as much about facing one of your own big threats