The only thing I find unfair is the fact of the creature frozen
thaw the opponent's turn, no leaving at least a chance to attack after thawing.
That would solve my problem. Out of frustration I wanted to see if I was the only one to find the Freeze/Congeal skill slightly unbalanced. I am annoyed by the fact that my creatures thaw at the end of the turn while I am using the Swallow deck because as soon as the opponent plays a Squid before I can play one Otyugh, I automatically lose the match. I would never be able to use the devour skill, unless I play another Otyugh in the same turn a frozen one returns to normality, provided the adversary has only one Squid on the field.
As it is now, unless you have a spell to get rid of it, one Squid can permanently control up to 3 creatures while one Octopus goes up to 4. It's not truly an unbalanced card in itself, though, since those creatures are pretty weak, however a minor tweak would make this skill more balanced.