That is nuts! Such powerfull ability can't have charges. Once per round - like Death's Shadow - would be more appropriate.Francesca's Mystic Echo => Harmonic Resonance : Charge 3, Give one unit Harmony and trigger all friendly units with Harmony.
Should the ability be too Strong with Fran, it's possible to give it to Calveit, instead, using Assimilate. But it shouldn't be applied to all factions because that would make the leaders, once again, boring.