Light of the Legion is a rare Creature — Angel card from Guilds of Ravnica Promos (PGRN), collector number 19s. Current market price: — (foil $0.62), TCGplayer market prices via Scryfall.
Flying Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) When this creature dies, put a +1/+1 counter on each white creature you control.