From the Publisher:

Prepare yourselves for the most spectacular show to ever grace the Crucible. Fun for all will be had. No one will go home disappointed. Feast your eyes on the thrills and wonder all under one roof as the greatest to ever be seen come together. The Menagerie calls for your presence and your attendance will be rewarded!

KeyForge: Menagerie decks are the latest crazy idea to emerge from the KeyForge development team’s secret lab. KeyForge: Menagerie decks provide their own unique KeyForge experience, each deck includes at least one of more than 50 different packets.