Ciel, Chevalier

Reach
Whenever this creature deals combat damage,
put a Soul counter on it.
{w/u}: Transform this creature.
{w/u}{w/u}, Remove X Soul counters: This creature deals X damage to target creature or player.
{w}{w}{u}{u}, {t}: Destroy target permanent.
"I'll become your shadow, as your shield, as your spear."