It is once per the attacker's turn (just noticed this power as worded would work in multi-player games, both team and even free-for all where one opponent is attacking another). In official heroscape, I can't think of a power of the top of my head, but in C3V it is more common such as
Emperor Andask for which this is a different version of:
Quote:
Orb of Vengeance Aura
When a figure you control within 4 clear sight spaces of Emperor Andask attacks an adjacent figure with a normal attack, before defense dice are rolled, you may re-roll all attack dice that did not show skulls. Orb of Vengeance Aura does not affect Emperor Andask. Orb of Vengeance Aura may only be used once per turn.
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