Cards like Seeker of the Way, Monastery Swiftspear, and Dragon-Style Twins will all be buoyed by Elsha's spellcasting, their own prowess abilities activating each time she reaches into the infinite in search of another spell
In general, the white Auras will buff your limited number of creatures (like Ethereal Armor, Knight's Pledge, and Angelic Gift), or disable your opponent's creatures (such as Pacficism, Petrify, and Candletrap)
Voice of Victory This won't entirely replace Grand Arbiter (since Arbiter stop activated abilities of cards like Ghost Vacuum too), but I can see this making its way into a bunch of sideboards because of the casting cost
Firstly, it's only two mana, making it cheaper than almost every other ETB sacrifice creature that sees play
On top of these Commander decks, multiple Secret Lair drops were also released soon after, with one including the absent 14th and 15th Doctors and Sonic Screwdriver, another with five Dalek-themed lands, alongside a third dedicated to the iconic Weeping Angels