This card was printed in the following sets:

Card Name: Symbol Set Block
Sigarda, Host of Herons Avacyn Restored (Mythic Rare) Avacyn Restored Innistrad
Sigarda, Host of Herons Ultimate Masters (Mythic Rare) Ultimate Masters Miscellaneous
Sigarda, Host of Herons Ultimate Box Toppers (Special) Ultimate Box Toppers 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!