Mana cost should be higher for the effect, but it's pretty good! :3

Not really, Boar Umbra has the same +3/+3 effect for the same price and totem armor, which I would say is equal to making it unblockable for a single turn at the cost of the enchantment.

You have a point.

Boar Umbra isn't a common though.. and the entire theme of RotE is bigger and badder. I'd want to see more cards of this set before saying if it too overpowered.

I second Talaris' comment. Something along the lines of 2GG or 4G would work.

The terminology is right on the button for the current rules, I think that the cost is lower then it should be, or the sack ability needs to have an activation cost on top of the sacrifice. If it cost "G3, sacrifice Cloak of Leaves: Enchanted creature is unblockable this turn" that means that it would still have the instant effect, but it would tie your mana for that effect, no freebie.

Otherwise this is a very nice card to go with the image. ^_^

Is "cloak of levees" a pun? I don't get it.

The cards cost is perfectly fine for it's abilities, tho the other ability could use a use cost, maybe 1 or two forest