This card was printed in the following sets:

Card Name: Symbol Set Block
Helm of Obedience Alliances (Rare) Alliances Ice Age Block
Helm of Obedience Masters Edition II (Rare) Masters Edition II Miscellaneous

This card has restrictions in the following formats:

Format Legality
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!