What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "How Civil of You." This doesn't match any official keyword, ability word, or rules term that I'm aware of.
It's possible this is the name of a specific card, a casual nickname for some interaction, a joke/silver-bordered reference, or something from a custom or unofficial set. Without knowing the actual card or mechanic you're referring to, I can't accurately explain how it works, its rules nuances, or its Commander relevance—and I don't want to invent rules that could mislead you.
If you can share the card text, the set it's from, or more context, I'll gladly break down what it does and how it plays in EDH. You might also double-check the exact name via Gatherer or Scryfall.
Iconic cards with How Civil of You
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