The morphling is way to limited. It cannot even copy the attack of the eel nor can it summon. It does not buff its unit and in most cases simply gives you just an additional melee attack. Furthermore it can only be attached to 3 units in GH. In my experience it is not on par with any other adjunct. You could try to copy the egg clutch "go to glory" action though.
Weakening the eel is possible, but then there need to be buffs in the units. Just take a look how casually gb units are removed by Abbysinia. Mech Infantry will kill a unit per turn easily. Concentrating fire/tracer rounds feel far from fair. First experimental weapons, then the engineer, then 2 fireteams and last the mech will shoot the brown stuff out of you. The mech will shoot with an AV of 11!!!! Once he has won he cansually lower the value to generate a 2nd attack.
Endless numbers is nice, but gives you back a non-glory crippled unit, that will again be easily removed. And it limits your precious tactics tokens; less interacts.
Electrocutioners are borderline broken with their gigawatt attack which is guranteed to work with the "you flip a 15 stratagem".
Egg clutches are basically glory Targets for aby. They do not care for los. So no hiding the eggs. Plus the non existing defence and armor
By now it is probably clear that abysinnia has gone german on my brazillian gibbering hordes. Therefore I admit that I m at least a little biased when it comes to them. The eels were pretty much the only things which kind of stood a chance against them.
I honestly do not see the need for the nerf bat on GH.