I don't think this will work. Maelstrom nexus says that the first spell you play each turn gets cascade. Epic says that you can't play spells anymore. There is a difference between copying a spell and playing a spell. Good thought though.
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If nothing else, I LOVE the name! Bloodsport references are so few and far between.
Volt charge would also be a good addition. Direct damage, plus adding counters to both your chalices and your reavers. I also agree that Phage would be a good addition.
If you're putting cancels in the sideboard just against creature-heavy decks, better would be essence scatter. Cheaper, less color cost, and allows you to save your mana leaks for other threats.