It turns all non-basic lands into mountains, essentially shutting players with greedy mana bases out of the game (unless they were playing mono-red)
Weatherlight Compleated shows the ship, once the bastion of Urza's efforts against the Phyrexians, compleated and wielded by New Phyrexia's forces against the Dominaria's defenders
He still needed a five-color effect to let players play all their Towns in Commander, so we were missing a short ability that contained Designing cards to work well in both Standard and Commander is a common challenge, and this is a common solution: designing the core functionality around what works in two-player formats, then adding a splashy expensive ability that sells a big dream and cements the build-around
The graphics pop with bright color and detail, and the roguelite elements ensure no two runs feel the same
Its a pretty good way to either give yourself more Creatures, or simply get rid of problematic Enchantments and Artifacts