What it does
"Heavy Rock Cutter" isn't a real Magic: The Gathering keyword or ability—it doesn't exist in the game's rules or on any official card. It sounds like it could be a flavorful Equipment name or a mechanic from another game entirely, but there's nothing in MTG's comprehensive rules or card database matching it.
If you encountered this somewhere, it may be a misremembered card name, a homebrew/custom card, or content from a fan set rather than an official Wizards of the Coast product. Real Equipment keywords you might be thinking of include things like Equip, Living weapon, or Reconfigure.
If you can share where you saw "Heavy Rock Cutter," I can help identify what it actually is or point you to the correct rules. Always verify custom cards with your playgroup before sleeving them up for a Commander game.
Iconic cards with Heavy Rock Cutter
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