What it does
"Transdimensional Scout" isn't an official Magic keyword or ability—it doesn't appear in the comprehensive rules or on any printed card. It may be a custom/homebrew card name, a misremembering of another effect, or something specific to a casual playgroup.
If you're thinking of a real mechanic, you might mean Scout (not a keyword) or effects involving exile and "blinking" creatures across the battlefield, like Flicker or Phasing. Cards that "scout" often involve scrying, surveilling, or exiling cards from the top of your library to play later.
If this is a Mythicwyrm-specific or custom card, check its actual rules text, since custom cards define their own behavior. Could you share the full card text? I'm happy to break down exactly how it works, the rules nuances, and its value in Commander once I know what it actually does.
Iconic cards with Transdimensional Scout
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