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1. No Vial
The only creatures you want to vial out are the Arcbounds and Disciples. Unlike Vial in Goblins, I got the impression that Vial in Affinity is one of the weaker cards. Paradise Mantle was also too weak. The best "fixer" is Chromatic Star.
I included some Needles in their places, and haven't regretted it so far.
In counter-heavy metagames, Vial is a better, so one might say this is a metagame decision. However, for a mixed metagame, I like maindeck Needle a lot better. I boarded them in so frequently that it's better to side them out if you don't need them.
Vial allows you to do combat tricks that wouldn't be available to you otherwise. It creates surpirse blockers, suprise creature pump with Ravager, and surpirse life loss with Disiple. Plus, Affinity needs Disciple/Ravager/Atog to do well. Vial guarentees that they come down. It also speeds the deck up and smoothes the mana base.
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With Atog, you're often going all-in, and that gamble hasn't paid off for me. It also was sitting uselessly in my hand too often for my taste, either because I couldn't cast him or he would have been useless anyway. Atog is also not an artifact, which surprisingly matters sometimes
You wouldn't have as many problems casting Atog if you played Vial. Atog is necessary, it makes the combo win more likely.