Azula, Ruthless Firebender

Oracle Text

Firebending 1 (Whenever this creature attacks, add {R}. This mana lasts until end of combat.) Whenever Azula attacks, you may discard a card. Then you get an experience counter for each player who discarded a card this turn. {2}{B}: Until end of turn, Azula gets +1/+1 for each experience counter you have and gains menace.