What it does
Fast Healing isn't an official Magic: The Gathering keyword or ability—it doesn't appear on any cards or in the comprehensive rules. You may be thinking of a term from Dungeons & Dragons, where "fast healing" lets a creature regain hit points each round.
In Magic, the closest equivalents are abilities like Regenerate (creates a "shield" that prevents the next destruction, tapping the creature and removing it from combat), Lifelink (damage dealt by the source gains you that much life), and Persist/Undying (returns the creature to the battlefield after it dies). If you saw "Fast Healing" on a card or in a custom/playtest context, double-check the exact wording.
For Commander specifically, if you're after recursion or damage mitigation, look toward indestructible effects, regeneration, or lifegain engines—and tell me the precise card text so I can pinpoint what's actually happening.
Iconic cards with Fast Healing
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