The latest Magic: The Gathering set Theros Beyond Death introduces a brand new god named Klothys, the God of Fate and Destiny in Theros. She is associated with red and green mana, and if you're wondering which part of the Gruul colors defines destiny, Magic head designer Mark Rosewater recently explained why.
"It’s not that red/green philosophically cares about destiny," Rosewater wrote on his Blogatog. "Green cares about destiny. Klothys is red/green because she has red means to achieve a green goal."
The character design of Klothys is not typically what you expect in a Gruul card but Rosewater's explanation makes sense.
The story summary of Theros Beyond Death revealed what happened to Klothys:
Klothys was furious. When Xenagos attempted to take her place in the pantheon, she was understandably upset. When countless souls dared defy fate to reverse their own deaths, she was livid. She dispatched countless agents of fate to stop these souls from seeking new life. But for Elspeth's, a Planeswalker's soul, she needed something special. So Klothys weaved her masterpiece—an agent of fate she called Calix. Created solely to carry out the will of Klothys, Calix headed off in pursuit of Elspeth in order to preserve that which should be.
Theros Beyond DeathMagic: The Gathering