The Saint of Dusk is templated to be tough to remove in Commander, requiring board wipes or sorcery removal, or creature EtBs
Keep away from light to preserve the red tones
Number 163 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Timeless, Vintage Not Legal Formats Alchemy, Modern, Pauper, Pioneer, Standard Rulings (8/25/2017) If you reveal your entire library and reveal fewer than X creature cards of the chosen type, you'll put the cards of the chosen type that you did reveal onto the battlefield and shuffle your library
Then tie it together with free cards that you've exiled for the mere cost of triggering disappear and you have an absolute target for your opponents to rally against or fall to