Aurelia, Exemplar of Justice is a mythic Legendary Creature — Angel card from Ravnica Remastered (RVR), collector number 436. Current market price: $19.32 (foil $44.30), TCGplayer market prices via Scryfall.
Flying Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.) At the beginning of combat on your turn, choose up to one target creature you control. Until end of turn, that creature gets +2/+0, gains trample if it's red, and gains vigilance if it's white.