Aven Warhawk is a uncommon Creature — Bird Soldier card from Legions (LGN), collector number 4. Current market price: $0.22 (foil $0.73), TCGplayer market prices via Scryfall.
Amplify 1 (As this creature enters, put a +1/+1 counter on it for each Bird and/or Soldier card you reveal in your hand.) Flying