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
As for continuous effects, red has a number of great options now
If you're lucky enough to draw your Sol Ring and Arcane Signet early, you can win with this deck as early as turn two , making it a pretty serious threat
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Kassandra was a supremely powerful Commander when factoring in fast mana, and I was regularly able to achieve a table kill with her by Turn 6, with eliminations occurring in conjunction with Excalibur, Sword of Eden as early as Turn 4
