Missandei, Arbalest Sniper

Reach
Position 4 — Whenever Missandei, Arbalest Sniper attacks, you may tap an untapped creature you control. If you do, Arbalest deals damage equal to its power to target blocking creature.(Gain
this ability if in position on upkeep. Change position during attack step, and only if you do not attack.)
"Shoot, bandage, and pillage; the dancing steps of war." — the Ancestor