Well, I would like to use this instead of FFQ to feed my Otyugh: Nevermore. Devour. Repeat. Both cards grow, and the Bone Wall is happy.
Problem is that it leaves the Raven vulnerable to CC... Which is a good thing, otherwise it would be OP

Killing the Raven yourself is a waste of cards and/or quanta: e.g., with Raven and Owl's Eye, you would need 2

and 2

to grow it by +1|+1 every turn... Not that good. And the opponent will probably not kill the raven either. This makes the Raven very Gargoyle-like: it has a duo-skill that, once activated, make it very unlikely that it will be killed, and is otherwise nearly useless. But in comparison to Gargoyle, it seems slightly UP: I would go for a skill cost of 1 unupped, and an attack of 4 upped.
That's a great card.
NeverFurthermore, Edgar Allan Poe is one of my favorite poets, close to Rimbaud.