I'm really enjoying using them, split Riot/Pirana deck with all 4 riots and Ahkab, Hawkins, Parmambard and the parott (Mr Coco?) Only really played ELO today but I made it to over 1200 in a few hours, so hopefully I can press for 1350+ next week.
Having them is total .balanced as overpowered. Using +1 Pillz per Damage techniques cards or having Vortex for their defeat can be a great performance to obtain new levels of power. But, I consider use Frozn. Thanks to Riots have a Victory or Defeat Bonus.