No buff needed, Basically a draining, more resistant, more expensive, Producer (RoL, Damselfy, Gnome Rider, Ash Eater). Its pretty poweful, for denial, speeding up decks, or just plain stalling out till you can burst out obsidian dragons or drainlifes.
Drainlife is Very important part of the card, making it very important, Id rather take a mono-darkness denial bolt deck than a Fire Stall.
Denial = Stall
Healing = Stall
Quanta production = Speed
Massive Dragons = Killing and speed
Devourer = Powerful but balanced creature