Scripts

You can attach the COMBAT_RESULTS_TRIGGER and, if the hero that needs to be resurrected loses a battle, check the owner of the mines and act accordingly. Something like this:

function fightResult(fightID)

local LooserName = GetSavedCombatArmyHero(fightID, 0)
if(LooserName == 'Aberrar') then
   if(GetObjectOwner("mine1") == 1) and
     (GetObjectOwner("mine2") == 1) and 
     (GetObjectOwner("mine3") == 1) and 
     (GetObjectOwner("mine4") == 1) and 
     (GetObjectOwner("mine5") == 1) and 
     (GetObjectOwner("mine6") == 1) then
   UnreserveHero('Aberrar')
   else
      DeployReserveHero('Aberrar', 46, 140, GROUND)
   end
end

end

Trigger(COMBAT_RESULTS_TRIGGER, 'fightResult')