Kentaro, the Smiling Cat uit de Betrayers of Kamigawa set

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

You may pay {X} rather than pay the mana cost for Samurai spells you cast, where X is that spell's converted mana cost.

"The bonds of bushido will draw the dishonored back someday, and I will be there waiting."