Steed of Fightful Darkness

{t} Target creature you control gets +2/+2 and
Menace until end of turn. When that creature
leaves the battlefield this turn, sacrifice Steed
of Fightful Darkness. Activate this ability only
during combat.
"The cavalry of darkness, they use indescribable
*things*. Much worse than horses. Some look silly.
Then comes the carnage of the charge. I won't even
describe the beasts, you'd just laugh." - Soldier of light