Nazra of the Stone Havens

Flash
When Nazra of the Stone Havens enters the battlefield, tap target creature, then create X 0/1 white Light creature tokens with "Sacrifice this creature: Deal 2 damage to target attacking creature." X is the number of tapped creatures your opponents control.
"Light is a powerful thing. It can provide a path in the dark, but I use it to destroy Zendikar's peril.