Guardian of the Great Conduit
A 2/4 with reach is a perfectly good roadblock on its own: it holds the ground and walls fliers without any further investment. The conditional clause is where the design intent lives. With a Nissa planeswalker on the battlefield, the body swells to a 4/4 and picks up vigilance, and that vigilance is doing the real work. The Guardian can crash in for damage and still come back to wall attackers aimed at the very planeswalker that powered it up, which is precisely the loyalty-protection problem green planeswalker strategies tend to struggle with: you want a body that threatens and defends in the same turn cycle, not one or the other. The card is narrow by intent. It offers nothing extra for a different planeswalker or a different color; the upside is keyed to a single name, and that specificity is the price of the payoff. This is glue for a deck assembling a Nissa-centric green board rather than a generic beater handed to every pool, the kind of build-around reward that only looks complete once the planeswalker it cares about is already on the table.
