In addition to taxing each of your opponents' spells by one mana, slowing them down significantly, Grand Arbiter Augustin IV provides you with a significant mana discount on your blue and white spells, respectively, providing an even greater cost reduction to Azorius spells
While not as effective on a turn-by-turn basis, Alms Collector is still my preferred draw engine of the pair
Especially because Artifact decks will tend to produce a lot cardboard for this to tap to generate mana
There's also a separate subset called The Big Score, giving you a peek at what everyone's scheming after
Not only does it stop those foretell spells in their tracks, it also can be used as a three-mana hard counter when another spell needs stopping
As for playing with Wilhelt in the wider format, I think its actually a really great option for Zombie decks, especially seeing as though you can lose a whole board of Zombies and get an immediate replacement board of decayed Zombie tokens