I don't have a strict definition of the term "one-sided" and it can be situational, but Ihink these cards will help you if you want to wipe out something but not be symmetrical about it. There are many cards that are situationally not symmetrical, such as Blasphemous Act but I'm not including them, though I can't tell you exactly why I don't include it but do include others. I include creatures that destroy all or most other creatures.
With the power creep in Commander there is almost no point in playing symmetrical board wipes like Wrath of God anymore.
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