What it does
I'm not familiar with "The Betrayer" as an official Magic: The Gathering keyword or ability. It's possible you're thinking of something else—perhaps a specific card name, a nickname for a card, or a mechanic from a custom/unofficial set (Mythicwyrm may have its own homebrew cards).
A few possibilities worth clarifying: there are cards named things like "Betrayal" or characters like Ob Nixilis, but no standard keyword called "The Betrayer." If you meant a real evergreen or set mechanic—like Treason effects (temporarily stealing creatures, e.g., Act of Treason), Goad, or something with a "betray" flavor—let me know which one.
If "The Betrayer" is a Mythicwyrm-specific custom card or ability, please paste its exact text and I'll happily break down how it works, the common rules pitfalls, and its Commander applications.
Iconic cards with The Betrayer
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