The Magic: the Gathering (MTG) set Scars of Mirrodin (SOM) was released on Oct 1st, 2010. It includes 10 token cards.
Scars of Mirrodin is an expansion set in the Scars of Mirrodin block. An expansion set in Magic: The Gathering is a pool of cards released together and designed for play in the same environment. Standard cards and tokens in a set can be obtained at random through booster packs. Sometimes a set will contain promo tokens that are given away as prizes at Friday Night Magic (FNM) or special pre-release events.