given the protection it gives to other cards and its hp being so high (and tied into the damage reduction), i would suggest either reducing the initial hp to ~4 or increasing the cost of the card by 1 or 2. reducing the effective damage done to other creatures and/or drawing fire away from them is a very potent effect, if it requires 3 shots, 2 lightnings/shockwaves, or 3 infects to remove one of them, the creature's cost should take that into account, or the hitpoints should be lowered to maintain the cost.
my reasoning- simple scenario: you have 2 of these guys in play, what does it take to remove them from play in order to effectively cc other creatures? a whole lot for just 6
from 2 cards. or they could try to damage your creatures through the -2 (or higher) damage reduction, which could very easily be an effort in futility. this will take playtesting to balance precisely, but my gut says the creature's power exceeds that of a 4
|3
card, given its current damage spongeworthy hp. throw in it's synergy with arigo and you have a 2000 baltimore ravens defense setup.