Need PQR Function for cheking target name and casting spell by dat name.

[DarhangeR]

Hello! Need a function or script for PQR on 3.3.5 with cheking name and casting spell only against this target name.
Like:

    Ward = nil    
function Ward()
    if UnitExists("target")
    and UnitLevel("target") == -1
        then
        local name = GetUnitName("target")
        if name ~= "Terestian Illhoof"
        or name ~= "Prince Malchezaar"
        or name ~= "Grand Warlock Nethekurse"
        or name ~= "Prince Arthas"
        or name ~= "Zul'Aman Tier 18 Training Dummy"
        then
            return true
        else
            return 
            end
        end
    end

And casting Shadow Ward or etc,