Looks alright to me, because the healing comes from a two card combo and damage is not THAT efficient compared to the high cost.
I'd like to ask those saying OP to clarify why.
If it seems too strong, you could raise the cost to 6-8 entropy and lower the attack accordingly. -20 for 8
![Entropy :entropy](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/entropy18x18.png)
is perfectly fine. Right now it might be a very strong powerhouse in entropy/aether stalls, which already has Quinted Purple Nymphs. Still will be beatable, but might be too frustrating.