Rin Yuu, the Nightshade

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
Rin Yuu, the Nightshade gets +3/+0 and
gains haste and first strike as long as an opponent has less than half of their starting
life total.
"Don't blink, or you'll miss me."