What it does
"Exterminate!" isn't an official Magic keyword—it doesn't appear on any printed card or in the comprehensive rules. You may be thinking of a similarly themed mechanic, or it could be from a joke/Un-set or fan-made card.
The closest real abilities are mass-removal effects like "destroy all creatures" (Wrath of God), "exile all creatures" (Merciless Eviction), or "each player sacrifices" effects (Plague Wind). These board wipes are central to Commander, where games sprawl wide and one well-timed sweeper resets dominant boards.
If you saw "Exterminate!" on a specific card, double-check the exact name and oracle text—it might be a renamed digital/Arena effect, a custom card, or a misremembered title. Without a real card reference, I can't give you accurate rulings, so confirm the source before building around it.
Iconic cards with Exterminate!
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