This card was printed in the following sets:

Card Name: Symbol Set Block
Hero's Downfall Theros (Rare) Theros Theros
Hero's Downfall Innistrad: Crimson Vow (Uncommon) Innistrad: Crimson Vow
Hero's Downfall Dominaria United Commander (Uncommon) Dominaria United Commander

This card has restrictions in the following formats:

Format Legality
Standard Legal
Brawl Legal
Pioneer Legal
Modern Legal
Legacy Legal
Vintage Legal
Commander Legal
Historic Legal
Alchemy Legal
Explorer 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!