Kazuul, Tyrant of the Cliffs

You're the defending player if a creature is attacking you, a planeswalker you control, or a battle you protect.

As the ability resolves, you can't put the Ogre token onto the battlefield without explicitly giving the attacking player the option to pay {3}, even if the attacking player has forgotten about this ability.

If you're the defending player, Kazuul's ability triggers once for each creature that attacks, not just once per combat. The attacking player chooses whether to pay {3} or let you have an Ogre token each time one of those abilities resolves.