When you have such a potent archetype you are just best off trying to do your thing as reliably as possible and Vial in singleton is not what you call reliable
It can be good under incredibly specific circumstances, but the stars have to align for it to make any real disruption to your opponent's strategy
Graded Population Report: Mew #2 Visualize the distrbution of grades in the chart
You could wind up not getting much mana out of it, but youll probably get a lot of it if youre using Klauth, Unrivaled Ancient with a bunch of other mid-to-big dragons
The epitome of crystalline elegance
However, on the flip side, Tornadus' rebound has been equally slow, as it continues to distance itself from the $20 plateau, with its current market price inching slowly toward the mid-20s