Cloud Elemental

A flyer with a built-in tax: the body gets a real evasive clock, but it pays for the privilege by surrendering its entire defensive value against anything on the ground. That second line is the whole design. Vanilla blue flyers have always been priced as do-everything bodies, useful on offense and defense alike; restricting the block to only fliers strips out half of what the creature is worth and lets the rate creep upward to a 2/3 for the cost. It is a deliberate trade of versatility for stats, the same lever Wizards has pulled with creatures that "can't block" outright, only softened: this one still patrols the skies, it just refuses to come down. The effect is a creature that reads as a wall in the air and a non-blocker on the ground, which makes it a clean answer to opposing aerial threats while doing nothing to slow a ground assault. Within blue's design vocabulary it sits among the color's earliest experiments in attaching a downside clause to a flyer to justify a better-than-curve body, a constraint that resurfaces whenever a set wants an aggressive blue evader without handing it a free defensive backstop.