yeah I noticed it, not immediately but before I posted
but that's the thing, it completely kills quite a few decks at absolutely no downside for a death or light deck. and flesh recluses and mummies and death nymphs are quite the rushers. angels aren't half bad too.
I can understand this point, but mind you a

duo isn't all that great for anyone who isn't the FG Morte.
It's not really the lowering of the def, it's just like this and a titanium shield in a stall deck means -6 damage PER creature. that's a hell of a lot of damage absorption. hell, this and just a plain tower shield is a lot.
Again, this implies a

or

duo. The only thing that I can see wrong, and am now thinking about it, is this + Skull Shield. Read my suggestion for fixing it.
now how to fix it... making it -2|-1 or -2|0 or even -2|+2. there has to be a downside for monodeath more than just the cost of the card. maybe death cards get hp reduced. maybe make this card last like 3 turns? or make it so it only applies to creatures over X hp or over X att. you could make this only work if there is an eclipse on the field or a cloak or both or something. plenty of ways to try to balance it, but can't leave it as is.
I highlighted the only option that I like in the quote, which would be adding a turn counter to it. I was also thinking something like (Upgraded):
"All creatures gain -3|1. Lasts 3 turns.
Pollute: Deal 1 damage to airborne creatures"
Do you think that would be better? Also, if it only lasts for 3 turns then I'm either gonna make both Pollute abilities free, or make it poison airborne creatures. Thoughts on this suggestion?