You can put Curse of Elements on Malygos in phase 3 by sacrificing a Warlock.
Have him fly over Malygos, dismount and spamming Curse of the Elements.
Yes, you lose one DPS but every other DPS will got 13% damage increase.
My guild usually do this with 3 healer drakes so we got 22dps drakes.
22 drakes with 100% damage is equal to a total of 2200% damage.
But when we do this, we'll got 21 dps left ( Warlock would be dead and can't dps anymore ) but each dps will do 113% damage which is equal too a total of 2373% damage.
So it'd make like you have almost 2 extra person on Malygos.
I think people who did Malygos would know how much 173% bonus is, since drakes do a lot of damage.
You'll get more damage unless you have less than 9 dps on Malygos
9 dps= 900% , with curse = 8 dps x 13% = 904%
8 dps = 800% , with curse = 7 dps x 13% = 791% which is less than 800%
So only worth on heroic Malygos since if you did this on normal, number of people are too low to overcome the sacrificing of one dps.