Cassia, Fervent Populist

Retribution (Whenever another creature you control dies, if it wasn't sacrificed, put a +1/+1 counter on this creature.)
At the beginning of your upkeep, if Cassia
has one or more +1/+1 counters on it, mobilize. (Create a 1/1 Citizen creature token
that's all colors or put a +1/+1 counter on a Citizen creature you control.)