I'm sure it doesn't run too bad, but you don't have any control at all. Someone drops an Ensnaring Bridge, and you will not win. How many people play Ensnaring Bridge? Not too many. But that's just one card that can put you on lockdown. Not to mention really fast decks. Like I said, doesn't look bad. But it does look like you just ran through and picked all of the expensive green creatures in the last couple of blocks and threw them into a deck.
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I don't think Mirran Crusader is, in general, necessary. But I don't see the need for Phyrexian Crusader. Same for Priests of Norn. I'd much rather see Mirran Crusader and maybe a Hero of Bladehold. Ultimately, a sub-theme of infect just doesn't make sense.
You forgot Deathgreeter. Mmm, mmm, mmm.