What it does
I can't find "Gatling Blaster" as an official Magic: The Gathering keyword or ability. It doesn't correspond to any real mechanic in the game—it may be a misremembered name, a card from another game, or something invented.
If you're thinking of a specific card, a few possibilities: you might mean a card named something similar, or perhaps a Universes Beyond/silver-bordered effect. There are cards with "Blast" or "Gatling" flavor in non-Magic contexts, but no Magic keyword by this name.
If you can tell me the exact card name or where you saw it, I can help identify the actual mechanic. Common keywords people confuse it with include things like first strike, double strike, or "deals damage to each" effects—but I'd rather give you accurate info than guess at rules for something that doesn't exist.
Iconic cards with Gatling Blaster
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