This card was printed in the following sets:

Card Name: Symbol Set Block
Master of Etherium Shards of Alara (Rare) Shards of Alara Shards of Alara Block
Master of Etherium Duel Decks: Elspeth vs. Tezzeret (Rare) Duel Decks: Elspeth vs. Tezzeret Miscellaneous
Master of Etherium Commander 2016 (Rare) Commander 2016 General
Master of Etherium Double Masters (Rare) Double Masters
Master of Etherium Kamigawa: Neon Dynasty Commander (Rare) Kamigawa: Neon Dynasty Commander
Master of Etherium The Brothers' War Commander (Rare) The Brothers' War Commander
Master of Etherium Planechase (Rare) Planechase 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!