Sascavatch

I really like this deck. It touches on a few of the more subtle aspects of explore that I enjoy greatly.

That being said, I'm going to suggest you drop the mainboard naturalizes. The card is too high variance to run four of off the bat. Personally I'd move them to the side board or run some Thrashing Brontodons in their stead, as the beefy body is pretty much always useful.

The other thing I'd be curious about changing would be finding some sort of repeatable mana sink for the late game. My rationale is that once you manage to get a few explore triggers, you're likely to have more mana than you can use, since exploring won't put any actual spells into your hand until your next draw step. The first thing that springs to mind is Oketra, but she's questionable in a deck with only 18 creatures in it, and you seem to be creating a Ixalan block deck anyway. There's some possibility in Black with either the repeatable explore creature or Journey to Eternity, but that involves some manabase rework that might not be worth. Although now that I think on it Winding Constrictor would let you beef up your team a lot faster at the low, low price of compromising the Ixalan Block Constructed status.

Anyway, food for thought. This deck still looks like it'll smash some poor aggro player's dreams, and that's my bar for enjoyable magic.

Glaze Fiend works incredibly well as an early threat if you play it before emptying your hand of all of those cheap artifacts. Evasiveness always helps, and it also plays very well with the Servo Schematics that everybody keeps suggesting (I would agree with them). Syndicate Trafficker is another alternative, giving you a threat that can also help you chew up artifacts when you just can't find a salvage titan.

I think adding more Scrap Trawlers will give you a strong engine to find multiple of your better creatures if one of them eats a removal spell. There are enough artifacts in the deck to consider Galvanic Blast as another burn spell since it's incredibly mana efficient, but I can also see plenty of cases where you're churning through artifacts for extra draws can't actually get full value out of the card.

Suggestions are greatly appreciated, as this deck looks incredibly fun but also exceedingly bad.

Or Thunderous Wrath/Thunderblust/Hell's Thunder

Methinks this deck could use Harness the Storm. Or Lightning Coils. Or Lightning Elemental itself.

B/W Lifegain was my first EDH deck, and I've run it with a few different commanders that all seem fairly competent at what they do.

Tesya, Envoy of Ghosts:
Really strong in creature-heavy metas, definitely helps with the 'You're never going to successfully kill me' vibe, but is a large mana investment for no immediate value. Unblockable commander damage can get free wins if she's uninterupted though.

Ayli, Eternal Pilgrim:
Requires a creature-heavy build in order to have much success, but having utter end on a stick shouldn't be slept on. Also has a lot of potential as a blocker.

Athereos, God of Passage:
Difficult to interact with, and slowly taxes your opponents out of the game. Has some political potential in multiplayer, since at some point an opponent will have to start giving you your creatures back.

Kambal, Consul of Allocation:
Underwhelming on its face, Kambal is probably the best BW lifegain commander for multiplayer. It feels bad to remove a 2/3, and feels even worse to skip a ramp or draw spell in order to not get drained for two, so most opponents play into him without complaint. He's also cheap enough to recast post board-wipe and keep the drain train rolling.

Karlov of the Ghost Council:
Seems utterly insane with the density of lifegain triggers in this deck, but I haven't personally played with him as my commander so I'm less sure.

All five of those are solid, and I would consider adding them to the 99 anyway.

Non-commander suggestions:
Darien, Kingof Kjeldor creates a semi-lock with any Soul Warden type effect, and this list seems to be running all of them. The other big thing I would mention is that the land count seems pretty light for EDH, especially since you aren't including other mana sources. You could probably cut the ten worst creatures and replace them with basics and it will run a lot better. I also highly recommend Greed and Erebos, God of the Dead for extra card draw

Hope that helps.

I am really enamored with the idea of this deck, to the point where I might go and make my own. I do have a few suggestions though:

Pull From Tomorrow is simply bonkers on its own, and in a deck like this one running mild discard synergies, it seems even more insane. It also fits really well with all of the cost reduction you're running.

Depending on how much you want to focus on discard and graveyard synergies, you may want to include more discard effects. Something slow and repetitive like Key to the City or more copies of Baral (Maybe some extra Sanitariums) if you want a lot of repeated value, or a few Tormenting Voices and Cathartic Reunions to improve hand quality and burn stuff.

Hope that helps.

I considered it, but the mana costs for this deck are really specific, plus I already have too many lands that slow the pace of this deck. Unless I start subbing for significantly more expensive ones, the deck can't get anything done in good time.