Burning arrow

Cast Burning arrow only if you control a Legendary scout. or a Arien planeswalker.
Burning arrow cost {2} less if you control an Arien planeswalker.
Burning arrow deals 3 damage to any creature you opponent controls.
If a creature will die this way exile them intead.
Cast a spell througth a arrow is very dificult. Need focus and skill in both at same time