Alongside card sets attached to titles, Valve has also released six special trading card sets based around seasonal sales.

Set Name Added
2013 Summer Sale
2013 Holiday Sale
2014 Summer Sale
2014 Holiday Sale
2015 Summer Sale
2015 Holiday Sale
2016 Summer Sale
2016 Holiday Sale
2017 Summer Sale

In addition, there's some sets which have been created but are impossible to obtain.

Set Name

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