1 Spire of Industry
As it turns out, during early development of Streets of New Capenna , the mechanic was known simply as "Splatter." And to be fair, this initial name was pretty accurate
Whats cool about this ability is two-fold: not only does it make more expensive members of the tribe free, but it makes creatures of the tribe that cost just one mana or two-colored mana absolutely free
If you ran enough of them, it may even be able to change the tenor of the deck slightly, like running more Pact of Negation or other choices
Treasure tokens can be sacrificed to produce one mana of any color
Including new Commander choices and chase rares for Constructed will likely make UNFINITY an easier purchase decision for devotees of those formats, as opposed to previous Un-Sets, which were sought after largely for their signature full-art basic lands