One word: Knights of the Round!

What materia, excluding the following of Mime after Omnislash, can do as much damage? We also exclude combos. That's right, folks. You COULD use combos to make summons do more damage than KotR, but you can make KotR do 4x damage with Quadra Attack and Mime that over and over and over.

And that's why I love FF7. I'd like to see Eden do damage.