It's the most popular entry point for collectors who want real cards with real value, not a gamble on a $5 repack
Whereas Dominaria had excellent common removal spells in white, blue, black, and red (with multiple good options across all colors and mana costs, excepting green), Guilds of Ravnica consenses most of its best common removal in black, blue, and white
Heck, Jaws doesnt even ask that the artifacts are nontoken, which opens up a huge range of extra options
The AI needs a single clear subject to anchor the creature design multiple subjects cause the feature mapping to blur between them, producing a generic result instead of a recognizable transformation
Then resolve the Guide of Souls trigger first, and have the Shrieking Drake bounce itself to your hand