My 2 cents.
Force nightmare - Would be nice with more life. If we get a way to make a creature lose life, this creature shouldn´t die immediately. The design is very clean though, and it works against non-living resilient
Nightmare eater - The idea of making two things at once (wolf spider) is okay, but very hard to balance correctly.
Nightmare knight - This is an okay card. I would rather see it make damage to other non-living creatures when daze is removed, instead of healing itself, but that is a design decision. One thing that I wonder is which part of this design is force?