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what you're asking for combines two separate alert conditions unfortunately.
node reboots are identified by a change to the LastBootTime of a device. this is gathered through an SNMP (or WMI) query, which means that you're not notified until the node is already back up. because of that, you're not going to find a condition like this that exists:
Alert me when the LastBootTime field has changed AND Status = Down > 5 minutes
You might be able to leverage a node down event from the Events table correlated with a change to the LastBootTime field, but that seems really apt to false positives/negatives and I personally wouldn't run down that road.