The Tarnished and Aurelia

Flying, ward {2}

Whenever The Tarnished and Aurelia attacks, you may pay {x}{w}{u}{b}. If you do, draw X cards.

At the beginning of each end step, you may pay 4 life. If you do, create a number of 1/1 black Vampire Knight creature tokens with lifelink equal to the number of cards drawn this turn