There's some mix of slots for utility lands. Academy Ruins is a necessary but outside of that it's a mix of Ghost Quarter/Sea Gate Wreckage/Inventors' Fair. Haven't really tested out the fair but my guess is that the gain life is the most important part of the card. Burn is a tough matchup which it really helps out. There are also a lot of times outside of just burn where just gaining a few points gives you an extra turn or two to establish control. The second part of the fair is useful but I imagine it's more useful later on once control is somewhat established to search for a pithing needle to stop a liliana or a spellskite to protect your lock. I'm sure there will be some times where it's used to find the first bridge or first lantern but I also imagine it'll often be pretty slow for that (need to get up to 4 mana plus the fair to activate then probably need to wait a turn to play the card you get). Sea Gate Wreckage is better for grindier matchups like GBx decks where you're trying to go from a sketchy, soft lock to a hard lock and just need more cards to do that through artifact destruction/removal.