First, the rule in question:
Savage Dominion
The shaman sends his mind winging into the wilds and possesses the largest creature he can find and bend to his will. Savage Dominion has a casting value of 9. If successfully cast, you can summon one MONSTER and add it to your army. Set up the summoned model within 6" of the edge of the battlefield and more than 9" from any enemy models. This counts as its move for the upcoming movement phase.
So what can I summon with this spell? Can I summon a Cockatrice? Galrauch? Daemon Prince? Keeper of Secrets? Chaos Lord on Manticore?, Kroq-Gar on Carnosaur? Nagash? Each of these have the '
MONSTER' keyword on their Warscrolls. Am I missing something, or is this one of those

rules?