Marauding Captain

"Looks like your dead, rocking that spear through the back of your head"
This card must move to and attack enemy creatures if able.
If an enemy creature is withing line of sight you can activate this effect:
{t}{x} Marauding Captain throws a spear to an enemy creature within its line of sight, the spear travels spaces equal to the mana spend. Any enemy creature hit by this spear takes -0/2