Lagorin, Soul of Alacria is a uncommon Legendary Creature — Beast Mount card from Aetherdrift (DFT), collector number 211. Current market price: $0.25 (foil $0.22), TCGplayer market prices via Scryfall.
Flying Whenever Lagorin attacks while saddled, put a +1/+1 counter on each of up to two target Mounts and/or Vehicles. Saddle 1 (Tap any number of other creatures you control with total power 1 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)