If the die roll is the chaos symbol, chaos ensues (see rule 311.7). The active player gets priority.
May 3, 2019 · War of the Spark
If the die roll is the chaos symbol {CHAOS}, any ability of a face-up plane that starts “When you roll {CHAOS}” triggers and is put on the stack. The active player gets priority.
January 25, 2019 · Ravnica Allegiance
If the die roll is the chaos symbol {CHAOS}, any ability of a face-up plane that starts "When you roll {CHAOS}" triggers and is put on the stack. The active player gets priority.
July 17, 2015 · Magic Origins
If the die roll is the chaos symbol {CHAOS}, any ability of a face-up plane that starts “When you roll {CHAOS}” triggers and is put on the stack. The active player gets priority.
May 1, 2014 · Journey into Nyx
If the die roll is the chaos symbol {C}, any ability of a face-up plane that starts “When you roll {C}” triggers and is put on the stack. The active player gets priority.
July 1, 2012 · Magic 2013
If the die roll is the chaos symbol {C}, any ability of a face-up plane that starts "When you roll {C}" triggers and is put on the stack. The active player gets priority.