Breena, the Demagogue is a mythic Legendary Creature — Bird Warlock card from Outlaws of Thunder Junction Commander (OTC), collector number 217. Current market price: $2.51, TCGplayer market prices via Scryfall.
Flying Whenever a player attacks one of your opponents, if that opponent has more life than another of your opponents, that attacking player draws a card and you put two +1/+1 counters on a creature you control.