Aven Tactician is a common Creature — Bird Soldier card from Dragons of Tarkir (DTK), collector number 6. Current market price: $0.04 (foil $0.40), TCGplayer market prices via Scryfall.
Flying When this creature enters, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)