Moss Viper

Green has printed the one-mana deathtoucher many times, and the pared-down variant strips everything but the keyword: a 1/1 for a single green mana, no rider, no way to fix its own poor combat math. That keyword is the whole pitch. A body that trades with anything it touches turns green's cheapest creature into a psychological wall, taxing attacks and punishing anyone who blocks or gets blocked. The catch is baked into the design: a bare deathtouch 1/1 answers one creature and then it is gone, and it has no way to reach a threat that would rather sit back. What it wants is a partner that forces the interaction (a grant of reach or pseudo-vigilance, a fight or bite effect that spends the deathtouch as ammunition, an equipment that makes the one-power body land damage on something worth killing). Standing alone it is a speed bump; channeled onto a target of your choosing, that same creature becomes removal at a rate no removal spell matches. Built for common-rarity Snake and reptile themes and for the floor of green's deathtouch package, its value is entirely a function of what you point it at.