Kentaro, the Smiling Cat 13/165 (Betrayers of Kamigawa)

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 mana value.

NM - $2.80
LP - $2.30
MP - $1.70
HP - $1.50
DMG - $1.50