First things first - READ the "READ THIS FIRST". Thread should be a poll.
Getting this card out early will shut down any creature based deck which is absurdly powerful.
No. Not "any" creature based deck. That's too far fetched.
I think it's too easy to snowball out of control with this card and he needs a nerf. I would suggest something like reducing the defence from both upped and unupped by 1 so he isn't such an early start, or maybe leave the defence the same, and increase quanta cost by 1 and the devour cost by 1.
Otyugh un-upped with 3 HP is borderline useless. In fact, almost no one uses Otyugh un-upped. Giving it one less HP is borderline ridiculous.
Upped creatures gain more HP. If we go and analyze every single creature's HP when upped/un-upped and compare it to Otyugh, we can then see what percentage of these creatures could he be able to eat in a non-buffed state. I think this has already been done because a thread like this has already been made, very likely. That aside, giving it less HP when upped would get it closer to un-upped - except you're in an upped environment, which means most creatures have gotten an HP boost.
Yeah, but at least for the upgraded version the only CC that reliably deals with it is Thunderbolt. Rain of Fire, Shockwave etc don't completely deal with it, and it's too easy to recover from that with things like Shard of Patience, Heavy Armour etc.
The only CC that "Kills" it is Thunderbolt. But dealing with it? Rain of Fire, Shockwave and etcetera will give it from 1 to 2 HP - which makes Oty useless. Now, it is true that if you pair it with Shard of Patience or Heavy Armor it will gain HP, but that does not make Oty the problem, but rather the combo being a problematic instance. In the same scenario, using SoPa yourself or Heavy Armor yourself will let you get out of Oty's eating threshold.