Safe Passage will be legal again next Friday when M13 drops. That'll protect you from Slagstorms in G/R Ramp and Aggro decks. Consider holding your Cloudshifts in the event you anticipate a Day of Judgement, you could at least protect a creature or two with temp. removal. Having Avacyn out would negate this whole topic though. Perhaps run another Avacyn?... Protect her from removal with a Faith's Shield?
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Why are you limiting to AVR only?
I love Landfall too. Gotta play lands anyway, why not take advantage... Dump the Walking Atlas for Sakura-Tribe Scout. Only a 1 drop with the same P/T and same ability. Were you trying to keep all the cards from the same block? And were you building on a budget of any sort? If you can afford it, try Primeval Titan's. Cast Titan, search for 2x Terr. Exp or Ev. Wilds, then sac those and search for 2x basic lands. 4 lands hit per turn... Plus the Titan is a 6/6... I would also suggest a few less lands and perhaps some removal like Beast Within.