This High Elf Lord on a Fire Dragon was at Warhammer World.
A soaring symbol of Ulthuan’s ancient martial glory, a High Elf Lord astride a Fire Dragon is a magnificent yet terrifying sight upon the battlefield. Clad in Ithilmar armour and wielding masterwork weapons, the noble prince commands the skies with unmatched tactical skill. Beneath him, the Fire Dragon, a creature of immense size and terrifying temper, acts as a living furnace. Channeling the scorching heat of its fiery blood, the beast looses a blazing stream of incinerating breath that melts armour into liquid metal, while its rider strikes down enemy champions from atop his scaled perch.
High Elf Mage on a Fire Dragon also at Warhammer World.
As with many models in the Old World range for Warhammer, this kit can be built as a High Elf Archmage on a Moon Dragon, or as here, as both a High Elf Lord and a High Elf Mage on a Fire Dragon.