Or any artifact hate in general. This deck would get so rocked by anything running artifact destruction, or even creature kill. Or for that matter, anything that runs creatures with evasion, like shadow or flying.
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Sedge Sliver, Necrotic Sliver, Cautery Sliver, Psionic Sliver, and there's tons out there. Look for more than just random synergy because all you run is slivers, you want to look for good combos within the abilities of slivers, because slivers can be really powerful, they just need to be well-constructed. Otherwise, you're just some n00b playing a sliver deck, like the ten other 12-year-olds.
Alright, this deck needs a lot of work. First, you're not running dual lands or any multiple-color producing lands at all, Pillar of the Paruns would even be a good card here, as it produces any colored mana for gold spells. Second, the slivers you are running are really bad. You need to look further than just playing a lot of slivers, and this deck leads me to question your reliability in your assertion that you won a tournament with this deck, or even at all. Some really good slivers are: