Overrun is a uncommon Sorcery card from Conspiracy: Take the Crown (CN2), collector number 189. Current market price: $0.20 (foil $0.48), 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.)