This is interesting. i know white loves life gain, and black can do it but only by hurting people, and i know orzhov loves doing its own thing...

I don't know about this though, i like it, but i dont know if it would be printed? Also i think curses should always be rare or higher. But maybe uncommon could past. this might wanna be rare though, a bit of a boring one, so i guess you could put it to uncommon just for fan service

hm. commanding someone to be miserable feels like it goes against the emotional idea.

Maybe something less proactive, and maybe a sort of static flavor text, like a less-terrible: You will neveer be happy again!