What it does
I'm not aware of "Stimpak" being an official Magic: The Gathering keyword or ability. It's possible this is from an unofficial source, a custom/homebrew card, or a misremembered name.
That said, the term strongly evokes the Fallout universe, and Wizards did release a Fallout Commander set in 2024. However, that set didn't introduce a keyword called "Stimpak"—its signature mechanics were things like rad counters and the Junk token. If "Stimpak" appears on a card, it's likely flavor text, a token name, or a custom card rather than a defined keyword ability.
If you can share the exact card text or where you saw "Stimpak," I can give you an accurate explanation of how it works and what rules nuances to watch for in Commander.
Iconic cards with Stimpak
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