[Standard; Opinion] Mardu Token

Craig Wescoe just posted a Jeskai tokens list over on tcgplayer that'd be worth looking at to see what changes you might want to make.  I also recall Frank Lepore having a video deck tech with a Boros token build (http://magic.tcgplayer.com/db/article.asp?ID=12101).  Neither is straight Mardu, but it wouldn't be hard to make the appropriate changes (toss in a few Thoughtseize, Mardu Charm, Butcher of the Horde as a finisher... pretty much call it a day).  Obviously you should deviate to match your playstyle, meta, and whatnot but it'd be a great place to start.  After you've given those look if you still have questions I can give your list a closer look.