Adarkar Windform

Air superiority for the cost of building around snow: pay one generic and a single mana from a snow source, and any creature loses flying until end of turn. That turns an evasive attacker into something your ground blockers can answer, or pulls an opposing flier off its assault entirely, without ever destroying anything. The catch is structural, not situational: the in the cost means the activation only fires if your mana comes from snow permanents, so this was conceived for a deck already committed to that subtheme rather than a generic blue control shell. The 3/3 flying body compounds the effect, because grounding the opposing skies leaves this clear to keep swinging through them: strip a defender's evasion and the same card becomes both the answer and the clock. It belongs to a quiet lineage of effects that police the air without killing: repeatable, instant-speed denial of a single keyword rather than removal. Against a board with no fliers the ability does nothing, which is exactly what keeps it a specialist: a tool for shutting down the one keyword it cares about, sharpest precisely when the opponent's plan depends on getting over the top.