This card was printed in the following sets:

Card Name: Symbol Set Block
Thrull Retainer Fifth Edition (Uncommon) Fifth Edition Core Sets
Thrull Retainer Fallen Empires (Uncommon) Fallen Empires Early Expansions
Thrull Retainer Masters Edition (Common) Masters Edition Miscellaneous

This card has restrictions in the following formats:

Format Legality
Legacy Legal
Vintage Legal
Commander Legal
Pauper 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!