Sarkhan, Soul Aflame is a mythic Legendary Creature — Human Shaman card from March of the Machine: The Aftermath (MAT), collector number 181. Current market price: $7.62 (foil $13.04), TCGplayer market prices via Scryfall.
Dragon spells you cast cost {1} less to cast. Whenever a Dragon you control enters, you may have Sarkhan become a copy of it until end of turn, except its name is Sarkhan, Soul Aflame and it's legendary in addition to its other types.