Vanquisher's Banner is a special Artifact card from Time Spiral Remastered (TSR), collector number 402. Current market price: $6.35 (foil $26.67), TCGplayer market prices via Scryfall.
As this artifact enters, choose a creature type. Creatures you control of the chosen type get +1/+1. Whenever you cast a creature spell of the chosen type, draw a card.