Stormscale Scion is a mythic Creature — Dragon card from Tarkir: Dragonstorm (TDM), collector number 123. Current market price: $3.93 (foil $3.49), TCGplayer market prices via Scryfall.
Flying Other Dragons you control get +1/+1. Storm (When you cast this spell, copy it for each spell cast before it this turn. Copies become tokens.)