local ScriptAddon = CreateFrame("Frame", "ScriptAddon", nil)    
function ScriptAddon:OnEvent(event, ...) -- functions created in "object:method"-style have an implicit first parameter of "self", which points to object    
    self[event](self, ...) -- route event parameters to ScriptAddon:event methods    
end    
ScriptAddon:SetScript("OnEvent", ScriptAddon.OnEvent)    
ScriptAddon:RegisterEvent("UNIT_SPELLCAST_START")  
function ScriptAddon:UNIT_SPELLCAST_START(unit)    
    local spell, rank, displayName, icon, startTime, endTime, isTradeSkill = UnitCastingInfo(unit)    
    if not spell then return end    
    if displayName == "Превращение" or displayName == "Прикосновение вампира" or displayName == "Соблазн" or displayName == "Сглаз" or displayName == "Гнев деревьев" or displayName == "Циклон" or displayName == "Лик смерти" then    
     self:SetScript("OnUpdate", self.OnUpdate)    
     self.unit = unit    
     self.total = 0    
     self.endTime = endTime/1000 -- this is equal to GetTime() at which the cast will end    
     self.unitName = UnitName(unit)    
    end    
end    

function ScriptAddon:OnUpdate(elapsed)    
    self.total = self.total + elapsed    
    -- only call function every 50ms to improve performance    
    if self.total >= 0.00 then    
     self.total = 0    
     local spell, rank, displayName, icon, startTime, endTime, isTradeSkill = UnitCastingInfo(self.unit)    
     if endTime and endTime/1000 - GetTime() <= 0.2 then    
      -- stop using performance heavy onupdate function if no spellcast is currently going on    
      self:SetScript("OnUpdate", nil)    
      if GetSpellCooldown("Тотем заземления") == 0 then    
       CastSpellByName("Тотем заземления",self.unitName)
      end
     elseif self.endTime-0.1 <= GetTime() then -- lost Unit (changed target e.g.), guessing cast timer    
      self:SetScript("OnUpdate", nil)    
      if GetSpellCooldown("Тотем заземления") == 0 then    
       CastSpellByName("Тотем заземления",self.unitName)
      end
     end    
    end    
end