This card was printed in the following sets:

Card Name: Symbol Set Block
Dreadhorde Arcanist War of the Spark (Rare) War of the Spark
Dreadhorde Arcanist Time Spiral Remastered (Bonus) Time Spiral Remastered

This card has restrictions in the following formats:

Format Legality
Pioneer Legal
Modern Legal
Legacy Banned
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!