Well, the problem with Immaterial creatures right now is that there is no answer to them other than a shield or a faster damage race. Immaterial creatures are immune to damage, infection, stasis (Procrastination), and targeted spells/abilities. I would like to see new cards like a pure board sweeping effect that kills all creatures or something instead of a "fix" to the current Immaterial status immunities.
Why are immaterial creatures a problem?
I've seen a lot of new players always complain about immaterial creatures but that is because they come from MtG and don't yet understand that having immaterial creatures is not an automatic win. If immaterial creatures were overpowered, everyone would have either them or Anubis. Right now that is not the case.
There's no answer to a weapon with Protect Artifact either (not even Sundial stops that) which is basically the same as having an immaterial creatures, but I don't see people complaining about that. If we get something that counters immaterial creatures, do we also get something that counters Protect Artifact?
Yes, immaterial creatures are immune to everything but
that's the whole point!