Haqim, The Judge

Haste, First Strike, Infect.
Whenever Haqim put a -1/-1 counter on a creature, that creature's controller sacrifice it. When Haqim deals combat damage, put a +1/+1 counter on it. As long as Haqim has three +1/+1 counters on it, it's unblockeable.
"There is no one who does'nt tremble at the slightest sign of our presence and that leaves in my mouth a sweeter taste than blood."
-Haqim, The Judge.