There might be a kind of card that combines with him ;)
I tried everything I can think of. The other goblins are killable. This one, just doesn't stack properly.
Ohhh ok, that sounds like a bug then, sorry about that!
Yeah, something about overflowing stacks probably. Some cards would show up in the. middle. (Origin coordinates?) And the goblin that appeared there could not be interacted with even when other cards could be moved (with some difficulty)