I know I'm a bit late, but I am making a samurai edh as well. When it comes to kentaro as the general it will not work the way Swedishsteel has mentioned. Kentaro has a color identity of white. You can't include cards that do not have his same identity.
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Myr Retriever + Myr Retriever + Mycosynth Golem + Grinding Station = Mill All the opponents :D
Lava spike from kamigawa is pretty good.. deals 3 damage to target player for 1 red mana
most people i play aren't fans of un cards.. so i tend not to use them at all.
CabooseReynolds