Nimuro, Honored General

Kiai X, where X is equal to Nimuro, Honored General's power. (When this creature attacks, tap target untapped creature you don't control with power X or less.)
Whenever Nimuro, Honored General becomes untapped, put a +1/+1 counter on it.
Samurai spells you cast cost {1} less for each counter on Nimuro, Honored General.