Ok, here is the opinion of a mono-life rusher.
First of all, Adrenaline is NOT a neccesity in a mono-green rush deck. Just for the record, I play without adrenaline and I have kicked a lot of butts without it. For me, the best/favorite life cards are the following:
1) Heal: Gain 20 hp just for 3 quantum is the meaning of a Life deck and a very helpful card in even rainbows decks (if upgraded to Improved Heal).
2) Cockatrice: ,especially in it upgraded "Elite" version! 3 quantum for a steady 4/4 (or 5/5) vanilla creature is pretty good. It has immunity to Maxwell's Demon ability, since atk=def, and abilities which deal 3 (4 if upgraded) or less damage cannot instant kill them.
3) Thorn Shield: A quite expensive yet very strong shield, capable of eliminating even the greatest rushing creatures over time via poisoning them. This card can literally be a Thorn in your opponent's back!