Dracosaur Auxiliary is a uncommon Creature — Dinosaur Dragon Mount card from Aetherdrift (DFT), collector number 122. Current market price: $0.22 (foil $0.25), TCGplayer market prices via Scryfall.
Flying, haste Whenever this creature attacks while saddled, it deals 2 damage to any target. Saddle 3 (Tap any number of other creatures you control with total power 3 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)