I don't think Stormcaller should be nerfed, but rather, the Voidwalker should be buffed. Nova Bomb is fabulous for a single smack of kills, but it doesn't compare to becoming Emperor Palpatine. The void neutral is still great, but I don't think it quite balances the tables.
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Both should occur. Stormcaller is the only super that can easily and consistently get a 7th column+ in a single use.