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Besides using SEJ (Satan Enters Judas) once Demonic imposter bands to a Heretic, what others was can a second Heretic join the battle?
Demonic Imposter is broken.
Foretold D is supposed to convert a hero in territory. Just messed it up, I'll fix it.
I don't think Hardened Hearts should be a curse. It's not a physical item like the other artifacts. If anything, a placed enhancement that sets itself into the owner's territory since it represents a heart condition.
Edited Foretold Decivers, Demonic Impostor, and Hardend Hearts... and added two Enhancements.
To consolidate the wording on Spreading Lies, you can make X=Number of Heretics set aside, and have it set aside X Heroes.
Rejecting the Truth is nice IMO, I just think you could leave out the change in abilities from the SA. It won't be used by non-heretics anyway as a 1/1, and making it just a 0/4 that ends the battle if used by a heretic matches other cards out there and I think is a good idea.