Magic: The Gathering Arena is expanding the type of events that don't require entry fees, and some of those events have specialty modes that don't require deckbuilding either, and that's why Wizards of the Coast will be introducing the Workshop series in the game.
As part of the Febraury 2020 State of the Game, Wizards revealed that the Workshop series will be limited-time events intended to give players a small taste of a variety of Magic formats, and you don't have to pay in-game gems or gold, or build a deck to join.
Players who earn their first win in each event will get rewards in the game, and the rewards vary from Workshop to Workshop —some will reward gold, others XP, and some individual card rewards (ICRs).
For the February 2020 update, here are the Workshop events that will be featured in game:
Each Workshop event will begin on Monday, and will be available for 48 hours.
In addition to the new Workshop series, MTG Arena will also have the new Festival of Gods events.
You can watch our Magic Arena video below: