Noxious Newt

Green's cheap accelerants have almost always come with a tax: a fragile body, no evasion, nothing to do once the ramp phase ends and combat begins. Bolting deathtouch onto the frame changes the second-half math. A blocker that trades with anything an opponent commits, no matter its size, is a genuine deterrent, so the creature keeps earning its slot after the mana it was printed to enable has already fueled an early play. The tension worth noticing is that the two roles compete for the same body: tap it for green and it cannot block, so on any given turn you are choosing between the ramp and the threat of a lethal trade. That choice is the whole design. In the mid-game, once you no longer need the acceleration, it resolves itself: leave the creature untapped and it becomes removal-adjacent, since attacking into a live deathtouch dork is a losing proposition for most creatures worth attacking with. The 1/2 body is the restraint that keeps it fair. It dies to nearly any burn spell, it will not win races, and it cannot pressure a life total on its own. What it does is refuse to become a dead card the moment ramp stops mattering, which is exactly the failure mode of the archetype's usual accelerants.