What it does
I'm not familiar with "Heavy Power Hammer" as an official Magic: The Gathering keyword or ability—it doesn't correspond to any real mechanic I can verify. It's possible this is a custom/homebrew term, a card from an unofficial set, or a misremembered name.
If you meant a specific card or mechanic, a few possibilities to check: there are Equipment cards with "Hammer" in the name (like Hammer of Nazahn or Colossus Hammer), and Equipment uses keywords like Equip and sometimes Living Weapon. "Power" might point you toward power-boosting effects or auras.
If you can share the exact card name or where you saw "Heavy Power Hammer," I can give you an accurate rundown of how it works and where it shines in Commander. I'd rather not invent rules for something I can't confirm.
Iconic cards with Heavy Power Hammer
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