For
monolith, have all airborne creatures not attack? or reverse wind and have them attack the enemy?
For
monolith, what do you think about my Energy idea?
here's the link: http://elementscommunity.org/forum/index.php/topic,20675.0.html
I think blocking all airborne might be too situational. (It also requires foreknowledge of the opponent's deck to be worthwhile.)
However your Energy idea is interesting. I personally would categorize a protection like that as Light not Life but I like the idea. Updated in the OP.
The OP is updated.
4 cards to vote on:

Fire Monolith (3 votes vs 6)

Blue Obelisk (4 votes vs 9)

Black Obelisk (3 votes vs 13)

Golden Obelisk (3 votes vs 5)
I need your support!
3 new cards in design theory for later

Light Monolith

Time Monolith

White Obelisk