Thank you for your response! It's always lovely to know I'm not quite as crackers as I thought.
What i wonder/haven't tested yet is how it affects the patron passive (that spawns a chimera) : if you have 3 agents and 2 summoned, does it count as a 5 combo ? or a 3 combo ? or a 2 combo ? I remember someone reporting not getting a chimera in spite of having played the right number of cards, wonder if it's connected.