I like and dislike somethings about this card. The name I really like, especially having studied a bit of neurochemistry, though of course these neurotransmitters are a little more complicated than that, but you can't exactly integrate the neurotransmitter into the game exactly as it functions in life, lulz. I do also like the more defensive side of
Life which this can clearly enhance, however I don't see the clear connection to the element of
Life, but I think I'll have to explain myself a bit more.
The first version of this card was essentially a counterpart to Adrenaline. Now, the way I see Adrenaline fitting in the element is that it's a card that can represent aspects of "fight or flight", a natural instinct of a vast majority of living beings. The way Adrenaline is incorporated, the opposite to it, chopping attack into a smaller number simply doesn't fit well with what
Life embodies, creature abundance and health.
I also have a distaste for rounding and awkward fractions that can make certain numbers seem more fair than others, but I digress.
Despite the fact that this change may be a little overwhelming, it would be interesting to see a card that essentially makes a creature attack multiple times without changing the overall damage it would do, without shields.
Consider this mechanic:
Target creature's attack is now 2. It attacks a number of times which would, in total, reach its original attack.
e.g. Original attack was 13, the now, 2|2 creature attacks 7 times to reach 14, 1 point over its original attack.
A status, Adrenaline would replace this, leaving the attack at 2.
With this type of mechanic, it's not purely reducing attack, however its allowing shields (pst Thorn Carapace), to do a number in terms of blocking damage, and doing harm themselves.
tl;dr: Interesting card, confusing elemental link, icky fractions.