Vaporkin

The trade is stated plainly in the second line: a 2/1 flier for two mana, which is an aggressive evasive rate, in exchange for being unable to block anything that does not also fly. This is the recurring template for blue's "skies" beaters, the lineage that runs through Welkin Tern and its kin: blue buys clean, undisrupted damage in the air by surrendering the ground entirely. The restriction is doing precise work. A 2/1 evasive body at this cost would otherwise blunt early ground aggression for free, so the design fences the card into the role it was built for: it attacks, it pressures opposing fliers, and it sits useless against the swarm of two-power ground creatures it would happily chump if allowed. The result is a creature with no defensive flexibility and a single job, which is exactly what an aggressive blue tempo deck wants from a two-drop and exactly what a controlling deck cannot lean on. It is the cheaper sibling of the Air Elemental tradition compressed into a clock rather than a brick wall, a reminder that evasion at a discount has always been paid for somewhere on the card.