What it does
"Peaceful Coexistence" isn't a real Magic keyword or evergreen ability—it doesn't appear in the comprehensive rules or on any printed card as a mechanic. If you've seen the phrase, it's likely a casual nickname for a playgroup's house rule (like a non-aggression pact or "turtle" agreement) rather than something the game enforces.
The thing players get wrong is treating table talk deals as binding. In Commander, social agreements ("I won't attack you if you don't attack me") carry zero rules weight—anyone can break them anytime with no penalty. The game only enforces what's written on cards and in the rules.
If you meant a specific card or effect, double-check the exact name. Cards like Pact-style enchantments or "no creatures can attack" effects (e.g., Crawlspace, Propaganda, Ghostly Prison) create real coexistence, but through stated, enforceable text.
Iconic cards with Peaceful Coexistence
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