Where is Balance ? Considering you are playing a single Swords to Plowshares and no Balance, I'm assuming you are planning to go 0-2 Drop after facing TNT round 1 and Oshawa Stompy round 2.
Isochron Scepter is a good card. Especially now everyone plays with Gorilla Shaman, Rack and Ruin, Disenchant, Stifle, Null Rod, Damping Matrix, Naturalize, Artifact Mutation, Uktabi OranUtan or Viashino Heretic.
[card]Meltdown[/card] is hardly a Cunning Wish target.
Quite frankly, your Keeper build looks kinda weak. You need more MD spot removal and a serious card advantage engine (and not a crappy 2 card Combo involving Scepter and Brainstorm or Fire/Ice). See Skeletal Scrying or Mind Twist.
found that Fire/Ice is a very strong option as it is a strong draw engine when combined with Isochron scepter
Yeah, It's sooo strong It will only net you your first card in two turns for an investment of 8 manas. That's not a strong draw engine. Skeletal Scrying would have net you +6 cards for the same investment.