Ureni, the Song Unending is a mythic Legendary Creature — Spirit Dragon card from Tarkir: Dragonstorm Promos (PTDM), collector number 233p. Current market price: $3.08 (foil $3.75), TCGplayer market prices via Scryfall.
Flying, protection from white and from black When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control.