This card was printed in the following sets:

Card Name: Symbol Set Block
Apocalypse Hydra Conflux (Mythic Rare) Conflux Shards of Alara Block
Apocalypse Hydra Modern Masters 2015 Edition (Rare) Modern Masters 2015 Edition General
Apocalypse Hydra Battlebond (Rare) Battlebond Miscellaneous

This card has restrictions in the following formats:

Format Legality
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!