Veyran, Voice of Duality is a mythic Legendary Creature — Efreet Wizard card from Magic Online Promos (PRM), collector number 90282.
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.