Yea the magma golem is going to either be targeted or avoided from my experience. mostly I come across players avoiding the magma golem bc of his slow trait. That said if you are playing the magma golem you are looking to try and do as much damage as you can as quickly as you can to do this. So either dealing with the threats or using the golem take down the biggest threats. You have to be flexible. I often run healing Madrigal with my siren if he does happen to be in the same zone as my mage or other creatures. The mage and/ or other creatures could guard if needed to help decrease the amount of damage being done on the golem. If using warlord I recommend a panzer gaurd with the healing Madrigal to help keep ur stuff alive.
I like lesser teleport, push, and/ or teleport to get him into position.