At the beginning of combat on your turn, creatures you control with flying get +1/+1 and gain vigilance until end of turn.
Whenever one or more attacking creatures you control die, you may return one of them to the battlefield tapped under its owner's control with a flying counter on it. Do this only once each turn.
If you're attacking with Rinoa and one or more other attacking creatures you control die at the same time, Rinoa's last ability will still trigger and see all of those creatures, including Rinoa.