MTG: Unsanctioned - Rules of Play says:
Unsanctioned contains five combinable 30-card, silver-bordered decks for wacky Un- fun. The set contains sixteen brand-new Un- cards to trip your Un- trigger, plus the reprinting of beloved Un- cards from previous Un- sets. It's unbelievable! Unsanctioned also comes with new full-art black-bordered basic lands that will do the Un- line proud—with a new Un- style and new art.