I haven't watched all the matches yet but isn't there a better sideboard alternative than Shattering spree ? Coz SP is CMC 1, and I'm guessing Chalice will most likely land on 1 against this deck.
That is true but replicate creates copies similar to storm. Chalice will not look at those copies. The other interesting SB option I see a lot is Meltdown. Sorry for being long-winded but hope it helps