Sending an email when a field value changes

Hello Community,

I've been tasked with creating a campaign that triggers an email when a field's value changes. In Eloqua, we have a contact field, and when it's set to a specific value, we need to send an email. We do want to send the email on a daily cadence.

Now the question I have is, how do I pull the contacts whose field value has been changed to a specific value in the past 24 hours?