Sideboard

Control enemy growth early with land kill and little global damage sources like pyroclasm. If the wurm or wumpus get bounced more than once, you're gambling that you can win the landkill race, but you really need to be able to start the race at least two mana ahead (from the elder + stone rain or the like) or else the forfiture of card advantage can be lethal. Ideally, hold the wurm or wumpus until you have a wildfire in hand, or ruination against a deck with lots of non-basics.