it seems a bit overpowered tbh. For a mono-entropy, using 2 cards you could convert all the enemy creatures into a chimera then use mutate on it. The mutant will then have gravity pull on it, allowing your creatures to kill it before the enemy can do anything with it... oh and it kills immortal creatures too, right? And as a duo, just reverse time on it or something... or even use maxwell's demon's paradox on it if the attack is higher than defense (which it will be after a turn of gravity pull). So... so far we have an amazing form of mass CC... and it also damages the opponent.
I'm sure it could be implemented with some weaks, but at the moment i see it as being too powerful.