War of the Spark is the 81st Magic expansion. It will be released in April, 2019. Officially, it is not part of a block. However, it is part of a series of three consecutive sets on the same world, unofficially referred to as the Guilds of Ravnica block.
While all previous sets on Ravnica focused on the ten Ravnican guilds this set will focus on the culmination of the Bolas Arc simply using the world as a backdrop. The storyline and set will revolve around the fight between the Gatewatch and Nicol Bolas. 
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War of the Spark is sold in regular 16-card boosters (one card being a marketing card), special Theme Boosters, two planeswalker decks, the War of the Spark bundle and a Deck Builder's Toolkit.
- ↑ Mark Rosewater. (January 11, 2019.) "Is war of the sparks set code wos or war or what...", Blogatog, Tumblr.
- ↑ Coming soon
- ↑ a b WPN Product info
- ↑ Mark Rosewater. (May 18, 2018.) "In the summer announcements video gavin mentions...", Blogatog, Tumblr.
- ↑ Mark Rosewater. (May 18, 2018.) "Going back to ravnica is exciting but getting 3...", Blogatog, Tumblr.
- ↑ Mark Rosewater. (May 20, 2018.) "As you look to revisit ravnica three times will...", Blogatog, Tumblr.
Magic: The Gathering sets