What it does
I can't give you an accurate rules explanation for "Tunnel Snakes Rule!" because it isn't a real Magic: The Gathering keyword or ability. The phrase is actually a reference to a gang from the Fallout 3 video game—and while Magic does have a Fallout Commander crossover set (released 2024), "Tunnel Snakes Rule!" is not a printed keyword mechanic in that product or any other.
If you encountered this on a card, it's likely flavor text, a token name, or a homebrew/joke card rather than a templated rules ability. Real keywords from the Fallout set worth knowing include things like Radiation (rad counters that mill you and deal damage) and mechanics tied to junk and energy counters.
If you can share the exact card text or a card name, I'll happily break down what it actually does and how it plays in Commander.
Iconic cards with Tunnel Snakes Rule!
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