Crocanura

Evolve and reach pull in opposite directions, and that tension is the design. Reach wants this thing planted on the ground, a 1/3 daring fliers to trade into it. Evolve wants it scaling up, taking a +1/+1 counter every time a bigger body lands beside it. Most evolve creatures are aggressors: small front-loaded bodies that snowball as you keep deploying. Hanging the mechanic on a defensive keyword instead produces something rarer, a blocker that gets harder to attack into the longer a game runs while still answering anything in the air. The crucial number early is the power, not the toughness: evolve triggers on greater power or greater toughness, and with the body starting at just 1 power, almost any follow-up creature clears the bar (even a vanilla 2/2 triggers it, since 2 beats 1). That low floor means the first few counters arrive cheaply. It does not stay that way: once the counters accumulate, each new creature has to outsize the current stats, so the growth self-limits, and a board of two-drops will stop feeding it long before it becomes threatening. What the stat line never does is end a game; the counters only widen its reach as a wall, making both the ground and the sky unprofitable lanes. It is quiet common-rarity defense for a green board that wants to keep playing bigger creatures and let advantage accrue one counter at a time.