Event Decks are a brand new feature in the game.

When you designate a Planeswalker to a node, you will be asked to set an Event Deck to that node, in addition to the Planeswalker.
In other words, you will have to set an event deck for each different node you play, according to the deck restrictions from that Planeswalker, event, and/or node.

The deck will be available until the end of that specif encounter, and all the decks you face were built according to the same restrictions. We hope this will make these events fairer in that you will not have to fight decks that are clearly not made to fit with the requirements asked.