Benefit: When you gain this feat, choose one domain-granted power that you can use to affect no more than one opponent. If you make a successful unarmed strike against an opponent, in addition to dealing your unarmed strike damage, you can use a swift action to deliver the effects of the chosen granted power to that opponent. Doing so provokes no attacks of opportunity.
most domain powers can only be use a limited number of times per day. So as the title asks, if you use the swift action for domain strike, does it use up a use?
Using your domain power counts as using your domain power for everything, so it would use up a use-per-day.