See Vraska's Viper.

More work with slither, along more basic lines. Without building around Slither, the creature gets to be unblockable once. I'm not sure how much of a bleed or even break this becomes when applied to a bigger creature in break. Unlike Lava Axe this is tied to a body, and unless given haste that damage isn't going to be seen on the first turn. Also using a creature to block essentially nullifies slither, since the creature with slither will have already dealt damage before you get to attack with your creature with slither.

I could see it in green. The memory issues remain though regardless of color.