As for having flying blockers, this may be personal bias, but I rarely see someone snag a win because they had multiple connects with beefy fliers
Cards over 10,000 yen will be double-sleeved, placed in a loader, and then placed in an OPP bag to prevent water damage
The galaxy holofoil energies are particularly targeted
Sidisi rewards your self-mill effects by giving you a 2/2 Zombie creature token when one or more creatures are put into your graveyard from your library, letting you get more value out of your triggers
You could build the deck around just one, but a mixture of a few will make your deck stand up better against different commander players
Consistent conditions prevent warping, fading, and mold growth that damage cards permanently.