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
War of the Spark had flooded Standard with dominant three- and four-drop Planeswalkers, later topped off with the two-drop Wrenn and Six in Modern Horizons
Again, giving your entire team unblockable is very powerful from a potential Commander
Gifting an opponent the monarchy is annoying, but in a deck with card draw punishers like Nekusar, the Mindrazer, you can work around it
These are good modes across the board, especially since Stifle effects tend to play out beautifully in Commander
What does Stormsurge Kraken do