Try Exava, Rakdos Blood Witch http://gatherer.wizards.com/Pages/Card/ … eid=369055

and Lightning Bolt http://gatherer.wizards.com/Pages/Card/ … id=234704?

How casual is your use of the deck? I find two way cards like Vines of Vastwood have won me games plenty of times and sticking to weenies allows me to lay a horde down faster than building up to a Viridian Corrupter. Check this out

http://deckbox.org/sets/207326