For me, there are three hallmarks of what make a cEDH commander/commander pair
Whether their enchantment type is a core part of their synergies or simple flavor, theres an enchantment creature for nearly any strategy
Prossh does three things very well: threaten large amounts of commander damage, provide sacrificial food, and act as a zero-mana sacrifice outlet
While I can imagine it being a problem if I'm storing multiple of these binders on a shelf, the advantage of a snap clip over a band is that it won't get snagged on other binders if I leave it loose, nor will it bend the cards if kept on all the time
The player with prize cards left or standing wins
In fact, I was going to pick it up back in November when I started collecting Pokmon cards again