Seems balanced but, again, it has kinda low damage
in a montana deck we usually have 4-5 damage cards (with good power + atk manip) + avola, in your deck you have 4-5 damage cards + greem, which is a little more predictable than avola and needs to strike early in order to be effective.
Nonetheless the deck seems quite playable and, with proper decision making, you can get a decent score, you just have to learn how to use it 