If you don't mind making it Extended, try Terminate and Blightning.
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Nice deck. Thinking about the sideboard, I would add Agadeem Occultist (if not add it in the main deck) and some removal, protection and/or graveyard recycling.
By "really serious" you mean "really expensive", right?
Thanks, but most of the time it fails in complete either way of winning (by constant damage with Valakut or overwhelming with plant tokens), so I think I will have to root to one of them.
This deck is extremely weak against Haunting Echoes or Meddling Mage. Maybe adding some other rats, like Swarm of Rats or (if you don't mind going Legacy/Vintage) Marrow Gnawer.
Yes, that's exactly why.
Nice deck, the mana curve ramps very nicely. I would change the Llanowar Elves for Overgrown Battlements, IMHO.
Nice deck, although I feel that the Invisimancer's ability is a bit wasted without a powerful creature to deliver unblockable hits turn after turn. I'll think about using Venser in my Ally deck, thanks for the idea :)
Ichor Rats play along quite fine with Hand of the Praetors. 2 Poison Counters just for hitting the battlefield :)
I would suggest changing Kozilek and Ulamog for Iona, Shield of Emeria and Stormtide Leviathan, they will paralize or slow down your opponent during the last turn between Mass Polymorph and attacking. Also, Garruk Wildspeaker can help in various ways (providing tokens, accelerating the mana curve by two lands, or letting you untap two lands after paying for Mass Polymorph in case you need to Mana Leak or Negate).
What are the Eldrazi Temples for?