A friend from work told me a interresting tactic to kill Magmaw,
They are a casual guild and killed magmaw now very easy what he said.
What they did have all people in melee range off magmaw,
with 1 ranged "hunter preferred" outside.
Magmaw will now always cast the adds on the hunter.
Hunter uses snakes frosttrap and all Can aoe them down quick that way.
The catch is that those in melee range need to go on the side of magmaw.
Even if 1 off them is outside off melee range the adds can also spawn on top of him or her,
and probably causing a wipe.
The rest like normal bring magmaw down quick with chains and burn him down.
And kill all adds before new spawn.
With their tactic you also have a set place where the adds spawn,
always a frost trap present and the adds will all move together.
So less moving and more time to dps.