This card was printed in the following sets:

Card Name: Symbol Set Block
Mesmeric Fiend Torment (Common) Torment Odyssey Block
Mesmeric Fiend Duel Decks: Sorin vs. Tibalt (Common) Duel Decks: Sorin vs. Tibalt Miscellaneous
Mesmeric Fiend Vintage Masters (Common) Vintage Masters Miscellaneous
Mesmeric Fiend Masters 25 (Uncommon) Masters 25 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!