Kentaro, the Smiling Cat

Kentaro, the Smiling Cat

Legendary Creature - Human Samurai | Power/Toughness: 2 / 1 (CMC 2)
Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
You may pay rather than pay the mana cost for Samurai spells you cast, where X is that spell's mana value.