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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.
Kentaro doesn’t change when you can cast Samurai. It just makes Samurai castable for generic mana.
Kentaro’s ability only applies while Kentaro is on the battlefield. You have to pay for Kentaro normally. It still costs {1}{W}.
