I had a big post, but I lost it. In a nutshell: ETutor and silver bullets are an option to deal with specific situations, something that could easily be a sideboard strategy. My short list of snipers: Phyrexian Revoker, Engineered Explosives, Ethersworn Canonist, Grafdigger's Cage, Humility (pretty hot with Lili Last Hope and ZPersecution), Oblivion Ring, Chains of Mephistopheles, Spirit of the Labrynth.