Combined with Prophetic Prism, Ichor Wellspring, and Perilous Research, we have that crucial element that can really make or break the success of a Pauper Deck: card advantage
For example, if X=3 on Blue Sun's Zenith, the spell has a mana value of 6 on the stack
Wrexial fits well into these types of decks, especially ones that mill your opponents
Despite its simple mana base and straight-forward game plan (cast Dragons up the curve and attack), the deck has a surprising number of synergies, is more powerful than it first may appear, and is a ton of fun to play
You can even couple it with a board wipe to your opponent and they get milled for as many cards as you destroyed
A mage can summon them or channel their magical energies into a spell