I don't believe there is any documentation on this. I think golem buff is about 25+ mana per 5 and 25% cd reduction. One way you can check is to press c when you have the golem buff and see how much your mp regen has increased. You can also make a similar calculation with the cd reduction. I don't get the lizard buff as often, so I'm not sure about the exact numbers. Either way, it's useful so if you can get it without endangering yourself or wasting time then go for it.