This card was printed in the following sets:

Card Name: Symbol Set Block
Lodestone Myr Mirrodin (Rare) Mirrodin Mirrodin Block
Lodestone Myr Planechase (Rare) Planechase Miscellaneous
Lodestone Myr Modern Masters 2015 Edition (Rare) Modern Masters 2015 Edition General

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!