What it does
"Mama's Coming" isn't an official Magic: The Gathering keyword or ability—it doesn't appear in the comprehensive rules or on any printed card. If you encountered this phrase, it's likely a joke, a nickname for a card or combo within a specific playgroup, or a misremembered name for an actual mechanic.
If you meant something else, a few real abilities sound vaguely similar in spirit—like "Myriad" (attack and create copies attacking each other opponent), or flavor-heavy commanders with tribal "mother"-type effects. There are also cards referencing matriarchs or summoning effects, but nothing keyworded as you've described.
Double-check the exact card name or wording. If it's a casual table term, ask your playgroup what game action they're tying it to, since house slang can mask a legitimate trigger, ETB effect, or attack trigger that does have real rules behind it.
Iconic cards with Mama's Coming
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