For example, think of Kenriths Transformation as purely a removal spell, with a bonus of being able to draw a card
If something refers to your commander while you have two commanders, it refers to one of them of your choice
Isshin wont be the only thing I build out of Kamigawa: Neon Dynasty
It lets you bit a little bit more aggressive with your Creatures, and it also means you can avoid some of the pesky ground plebes too
With low mana value mana rocks seeing more play in modern Commander decks, Sunder and other mass land destruction cards arent quite as backbreaking as they used to be, but that just means you might need to play 2 spells or wait until an artifact board wipe has been played by somebody else to slam the doors on your opponents ability to produce mana
The signature versions are shown below, and non-signature versions look the same just without the signature