So, one of my favorite cards from Eldritch Moon was always Permeating Mass. Sure, its difficult to use, but you can’t deny its powerful. Actually very powerful. The problem is that its risky. If the Mass gets going, you’ll just lose all your own creatures as well.
Unless, their somehow protected from it. For example, in my EMN Prerelease deck I had a Permeating Mass and I played it happily, because I also had Voldaren Pariah and two Ishkanah, Grafwidows, who could do damage without having to enter into combat with all that Mass.
I was watching a match on SCG, where there was a WU Heroic versus GW Megamorph. At one point, the latter put the former into a very bad position by playing a Boon Satyr on a Den Protector to bypass blockers on the Heroic side.
My thought: Why wouldn’t the other side use this evasion?