Oath of Chandra is a rare Legendary Enchantment card from Oath of the Gatewatch (OGW), collector number 113. Current market price: $0.27 (foil $0.50), TCGplayer market prices via Scryfall.
When Oath of Chandra enters, it deals 3 damage to target creature an opponent controls. At the beginning of each end step, if a planeswalker entered the battlefield under your control this turn, Oath of Chandra deals 2 damage to each opponent.