Cloud Spirit

A skies beater built on a clean tradeoff: the 3/1 body hits hard in the air, but the blocking restriction means it can never come back to defend the ground. That restriction is what funds the rate. An unconditional flier of this size for this cost would be undercosted, so the design pays for its aggression by making the creature a pure offensive tool, able to chump or trade only against other fliers and otherwise watching the ground game pass beneath it. The fragile toughness compounds the bargain: it dies to almost any burn or combat trick, so it represents tempo more than board presence, the kind of creature you commit to a race and expect to spend rather than hold. The "can block only creatures with flying" template recurs across plenty of evasive Spirits and birds, but rarely on a body this aggressive for the cost, which casts this one less as a defensive role-player and more as a clock with a built-in liability.