MArcomage

this card could be pretty powerful to be a common, with standard facilities it does 18 damage. so first thing I suggest to make it uncommon, maybe without the x0 production.
about the name, what about "Soul echo"?

But it does 18 damage for 18/22/23 resources.

yes, that's true, but a card like that it will obviously be played with low resource, so that the -N loss it's not so important.
anyway yes,-N is too much, it should be divided between briks, gem and recruits.
-N/3 is better I think

Agreed. And that can be an uncommon.