Oath of Chandra 
Legendary Enchantment
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.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL