Published Apr 30, 2026, 12:05 PM EDT Magic: The Gathering lead designer Mark Rosewater's new TCG heads to Secret Lair Mood Swings is an attempt to solve one of Magic’s biggest problems Image: Wizards of the Coast One of MagicCon Las Vegas 2026’s most mysterious events this weekend has nothing to do with fracturing the multiverse of Magic: The Gathering or introducing the Avengers into the mix. It’s something previously listed as Secret Lair Presents: [REDACTED] with Mark Rosewater , Magic’s head designer. Back in February, Rosewater teased the debut of a non- Magic game on his personal blog with a post full of redactions . During a press preview earlier this week, Wizards of the Coast revealed to Polygon that the mystery project is Mood Swings — a decades-in-the-making experiment that reimagines what a trading card game can be. At a glance, it’s easy to call Mood Swings a “ Magic -lite” card game. But that undersells what Rosewater is actually trying to do here.…