What it does
I'm not familiar with "Echo of the First Murder" as an official Magic: The Gathering keyword or ability, and I don't want to invent rules for something that may not exist or that I'd describe inaccurately.
It's possible this is a specific card name, a custom/unofficial card, or a term from a particular set I'm not recognizing. If you can share the full card text or tell me where you encountered it, I'd be glad to break down how it works, the common rules pitfalls, and its relevance in Commander.
If you meant a different, established keyword—like Echo, or an ability from a specific card—let me know and I'll give you the full rundown.
Iconic cards with Echo of the First Murder
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