The first is a triggered ability: "When this permanent enters, target player may search their library for a card named Mothers Yamazaki, reveal it, put it into their hand, then shuffle." The second and third abilities represented by Mothers Yamazaki's "partner with itself" keyword modify the rules for deck construction in the Commander variant and have no function outside of that variant
And while these spells have impressive effects on their own, new magecraft abilities will reward you even further
Its a good way to cross-promote both products, so if you havent picked up a physical booster pack yet, consider doing so
However, after a feeling that some sets were so flooded with serialized cards that they werent as special anymore, WotC changed tactics and moved to one featured card instead
7: Mayhem Devil Mayhem Devil doesnt care what sort of permanent is sacrificed or what player is sacrificing, its going to deal a point of damage to somethinganything