The hate spike wouldn't work, cause the hate is on the pets and not the master :< I really like this idea. It will give us SMNs more reason to use Odin and Alexander(of which I have summoned both only a handful together).

2 2-hours being used, 2 players becoming weakened and having all their MP used up, That's pretty steep.
If you want to take it further, though, make it so that the SMNs involved in this attack have all their stats reduced to 1 for 5min and cannot be removed by any means(even being KO'd). They MUST sit through being 1-shotted by anything for those 5min. This is only if you really want a severe "balancing" effect for this attack combo.

I would seriously love to use my odin/alex macro more haha