Either make a friend at the table and use this as a beneficial double-Vampiric Tutor for two players or get to scheming and try to break the symmetry
I am very unsure of going down to three Downfalls, but maybe we are supposed to sideboard the fourth, perhaps instead of the second Aetherspouts, or possibly even the second Tasigur
Ureni is the Dragon-specific commander here, letting you take a peek at the top eight cards of your deck when he enters or attacks and snagging a Dragon creature from among those cards and putting it directly into play
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