The Faction Dragon is a mythic Legendary Creature — Dragon card from Unknown Event (UNK), collector number MZ03a. Current market price: $5.29, TCGplayer market prices via Scryfall.
Flying If The Faction Dragon is your commander, choose a faction during deck building. This card's mana cost is that faction's mana symbols. (For example, if you choose Abzan, it costs {W}{B}{G}.) Spells you cast with the chosen faction's watermark cost {1} less to cast. Other creatures you control with the chosen faction's watermark get +1/+1.