The kicker doesn't seem like a green effect to me, and I think you have to say "life equal to" rather than "that much."

to clarify, the wording should be:

Target player shuffles their graveyard into their library. If Psychosis was kicked, that player loses life equal to the number of cards shuffled this way and you gain that much life.

So it's changed the first time, but fine the second time cause you've 'defined' the amount.

Honeslty this might be cooler as a split card since both blue and green do this, and has a kicker

I agree with both of froggy's comments

👍