Overrun is a uncommon Sorcery card from Duel Decks Anthology: Garruk vs. Liliana (GVL), collector number 24. Current market price: $0.50, TCGplayer market prices via Scryfall.
Creatures you control get +3/+3 and gain trample until end of turn. (Each of those creatures can deal excess combat damage to the player or planeswalker it's attacking.)
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