This card was printed in the following sets:

Card Name: Symbol Set Block
Armageddon Clock Revised Edition (Rare) Revised Edition Core Sets
Armageddon Clock Fourth Edition (Rare) Fourth Edition Core Sets
Armageddon Clock Antiquities (Uncommon) Antiquities Early Expansions
Armageddon Clock Masters Edition IV (Rare) Masters Edition IV Miscellaneous

This card has restrictions in the following formats:

Format Legality
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!