Sealed

From Archon Arcana - The KeyForge Wiki

In the Sealed format, each player receives a new deck at the tournament, usually by purchasing it from the hosting retailer. Players do not open their sealed decks until the official start of the event, and players are encouraged to wait to register the decks to their Master Vault accounts until the end. After opening their decks, players are given a few moments to read through and familiarize themselves with their contents, then the tournament begins.