Event: Fables of Eldraine
Node: Wishful Merfolk
Cephalid Colleseum caused life loss at the start of the turn. Breeding Pool was cast, and its EtB trigger did not recognize the life loss. No gems were converted.
Hello @jtwood,
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me 
Rebeca.