Unlike other popular alternatives like Mithril Coat and Bastion Protector, Vexilus Praetor also makes your Commander unblockable

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Creatures like Cunning Nightbonder and Slitherwisp let you play threats at instant speed to back up Nymris
Nearly every card fits the theme
In a blog, Mark Rosewater, lead designer on the game, said that it is counter-intuitive to have the Ring bring in-game positive effects, but it was the only way to get players to actually interact with it
A better version runs Phyrexian Altar which does the same thing as Storm but cheaper and doubles as your sac outlet