MArcomage

How does the mage keyword fit in this concept? Based on it's name, I'd picture an "Ethereal horror" as a scary ghost, not a scary ghost that also happens to be a wizard.

Maybe he was a wizard before he died and became ghost. Let's name him Ghostdalf :P

Heh, I was thinking more along the lines of 'Ethereal <insert magic-thingy here>'.:) Though I also believe that either taking away the mage keyword or increasing resource cost(along with a change in name) would balance the card. Banish is a strong keyword, and in most situations this card effectively deals 20 damage, which is, while pretty tame for an uncommon, still feels a little too beefy along with the mage tokens it gives.
(Hmm... This "good but too much" argument sort of applies to my own Dark seal card... I guess some self-nerf's on the way.)