Aurelia, Exemplar of Justice (GRN 153)

Legendary Creature — Angel • Mana cost: {2}{R}{W} • Guilds of Ravnica • Mythic

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.

Illustrated by Chris Rahn.