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The one time clause seems weak, but you are playing a 2 drop 3/2 at uncommon, and that is an aggressively costed creature

Other effect is fine

Balmor, Battlemage Captain Fists of Flame and Crash Through are wonderful spells for a storm deck, but Balmor, Battlemage Captain is the creature you need for these decks

In fact, this head looks almost exactly like the Chatterer Cenobite

Longer answer: Coven is an ability word , and as such it varies from card to card

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