This card was printed in the following sets:

Card Name: Symbol Set Block
Thunderbreak Regent Dragons of Tarkir (Rare) Dragons of Tarkir Khans of Tarkir
Thunderbreak Regent Adventures in the Forgotten Realms Commander (Rare) Adventures in the Forgotten Realms Commander
Thunderbreak Regent Jumpstart: Historic Horizons (Rare) Jumpstart: Historic Horizons

This card has restrictions in the following formats:

Format Legality
Pioneer Legal
Modern Legal
Legacy Legal
Vintage Legal
Commander Legal
x For more information regarding each format and play style modifications, visit the Banned / Restricted Lists for DCI-Sanctioned Tournaments page on the Magic: The Gathering website.

Gatherer works better in the Companion app!