Forum:Question about Ritual Beast Return

Can you activate Ritual Beast Return when you have no card banished or in your grave to summon the monster you banished as a cost for the card? My opponent said, the targeting was a part of the cost and therefore I couldn't activate the card without cards in the grave or banished, but if that would be the case, I also shouldn't be able to summon the monster I used as cost, which is contradicted by the card tips for Ritual Beast Return.