Veyran, Voice of Duality is a mythic Legendary Creature — Efreet Wizard card from Tarkir: Dragonstorm Commander (TDC), collector number 310. Current market price: $2.17, TCGplayer market prices via Scryfall.
Magecraft — Whenever you cast or copy an instant or sorcery spell, Veyran gets +1/+1 until end of turn. If you casting or copying an instant or sorcery spell causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.