Consider professional authentication services for high-value cards
For example, if you control Traveling Chocobo ("You may play lands and cast Bird spells from the top of your library.") and Jidoor, Aristocratic Capital is on top of your library, you can play Jidoor, Aristocratic Capital, but you can't cast Overture
GME becomes the path of least resistance to submit to PSA, and in turn, PSA starts to build a presence in retail
And since its uncounterable spot removal mode pops it into the graveyard, it also helps to fuel the deck's graveyard strategies, synergizing with mechanics like Harmonize and Collect Evidence
you may look at the top card of their library any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way. We already wrote about this floating eyeball in-depth, but the long and short of it is that you can always choose the best player for whatever you need, and thats the kind of flexibility you really want in any deck, let alone in your commander
If you control demons, they can drain your opponents each turn while giving you card advantage