Kami of the Waning Moon

Creature — Spirit

Flying Whenever you cast a Spirit or Arcane spell, target creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

"For a moment, Reito's defenders regrouped. Then wailing kami reappeared to send them scattering like flocks of frightened birds." —*Great Battles of Kamigawa*