The obligatory rare land seems to point to all these Caves having activated abilities.
Land - Cave (Rare)
Sunken Citadel enters the battlefield tapped.
As Sunken Citadel enters the battlefield, choose a color. T: Add one mana of the chosen color. T: Add two mana of the chosen color. Spend this mana only to activate land abilities.
This card does two things: show the WU draft archetype of artifacts-matter for LCI Limited (like in ONE), but also points to an old raceof giants as an interplanar empire.
Master's Guide Mural3WU
When Master's Guide Mural enters the battlefield, create a 4/4 Golem artifact creature token.
Craft with artifact 4WWU(4WWU, Exile this artifact, Exile another artifact you control or an artifact card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)
// Master's Manufactory
Artifact T: Create a 4/4 Golem artifact creature token. Activate only when Master's Manufactory or another artifact entered the battlefield this turn. "The Fomori are a horrible, distant memory, but their war machines have taught us much about mass armory."
—Anim Pakal of the Thousand Moons
Hmm, maybe the Fomori made those "Coin Empire" coins Quintorius is researching if it wasn't Ixalani who created them (like this block's stories imply)?
It seems that way. I am just surprised that the Fomori apparently were the giant colonizers that the Oltec were talking about. Last we heard of them was in Planechase if I remember correctly... and Future Sight.
The problem with defining this format by what is "fun" is that everyone seems to define fun as what they don't lose to. If you keep losing to easily answered cards, that means you should improve your deck. If you don't want to improve your deck, then you should come to peace with the idea that you are going to lose because you chose to not interact with better strategies.
Ayo the Fomori were from Ixalan? I thought they were from the plane of Ir, unless Wizards is gonna retcon all that.
No, apparently, according to the main story, millenia ago, the ancestors of the Oltec were close to being conquered by who they call "the colonizers", which were giants in enormous flying machines that appeared out of nowhere. They were the ones who closed the inner sun off in the first place. Quint thinks that they are equivalent to the "coin empire" he is researching that has left artifacts all over the multiverse and seemingly was present on multiple planes ages ago. The main story even ends with him exploring one of the downed ships that's been left in a closed off part of the core and accidentally waking one giant up from what appears to be some kind of suspended animation.
Well, and the card here now indicates that the coin empire was in fact run by the ancestors of the Fomori (which are indeed from Ir) who have apparently once travelled the multiverse and tried to colonize it. Not a retcon, but a twist I certainly wouldn't have seen coming.