"You spelled greater wrong.."
-typo, not spelling error. just semantics, will fix it eventually.
"Does it nightmare greater horrors even if they target a horror?"
'The nightmare cast will always be of (Greater) Horror, so if you are facing another
deck, they could gain some of their own Horrors by intentionally targeting your Horror.' - note the greater is in parenthesis, so its relative.
"+2 atk, 5->7hp and the ability improves as the number of CC attempts increase.
Probably too much of an upgrade."
could increase the cost by 1 and the +2|+2 to +3|+3. the abyss crawler model. i just wanted the greater horror to feel beefy, like a giant undead rabbit, not just a slightly stronger one.
"Sidenote: The opponent will lose a draw and some minor hp every time Horror triggers."
yep, nightmare is a hell of a drug. and taking it all into consideration makes it a hell of a reason not to target them unless you really want to.