The Black Knight

First Strike, Vigilance
Protection from White

Pay 1 life, put a -1/-1 counter onto The Black Knight: Destroy target creature that was dealt damage this turn.

When The Black Knight dies, if his power was 0, return him to the battlefield tapped.

"None Shall Pass"
"All right, I'll do you for that!"
"We'll call it a draw." - The Black Knight