The Sun gave Thomas the core designation earlier in January, meaning the only way for Thomas to be moved was via a sign-and-trade

I hope you’re sitting because the massive free agency deals aren’t slowing down. First, Kelsey Plum and Jewell Loyd were traded, and now five-time WNBA All-Star Alyss Thomas is on the move. Thomas is reportedly joining the Phoenix Mercury via trade, the second landscape-shifting move in less than a week.