This card was printed in the following sets:

Card Name: Symbol Set Block
Mary O'Kill Unstable (Rare) Unstable General

This card has restrictions in the following formats:

Format Legality
This card is not playable in any formats.
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!