Luminollusk

The Vivid ability word ties this creature's payoff to a deckbuilding statistic green rarely bothers to maximize: how many colors are represented across your board when it enters. A mono-green board gains one life; a table full of gold permanents and colored artifacts turns the same trigger into a real cushion. That makes the lifegain a reward for spread, not for casting, and it sits in tension with green's usual instinct to stay disciplined on color. The deathtouch body is the honest part of the package: a 2/4 with deathtouch trades up against almost anything on the ground and holds a flank without asking for support, so it does useful work even when the color count is low. What the design is doing is stapling a color-count meter onto a defensive creature and letting the two halves scale on different axes. The floor is a competent blocker; the ceiling only arrives if you have already built wide across the color pie, so its best home is a deck that was already splashing rather than one bending its manabase to accommodate the trigger. It is a rate that pays off a decision you made in the manabase long before this ever hit the battlefield.