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about Shattering Spree: It's _easily_ the best choice in this slot. If you draw it against Affinity, it's game (no they simply do not recover). 3 is fine, I wouldn't blame anyone for playing 4 though. Shatterstorm and Null Rod both hurt yourself A LOT so don't even think about it.
No, Affinity can recover. You either attack their team or their mana with Shattering Spree. Affinity is fast as hell. If they are one turn from lethal, Shattering Spree for RRR may save you, but they can still rebuild their offense the next turn or reequip Cranial Plating to a new creature or Blinkmoth. If you think 3 Shattering Spree is enough against Affinity, you need to play the matchup more.