Vona, Vicious Conqueror

First strike, crusade 3 {3}{w}{b}. (Whenever this
creature attacks, you may pay {3}{w}{b}. If you do, defending player loses 3 life, and you gain 3 life.)

Whenever an opponent loses life, you may pay {b}. If you do, that player discards a card.
Whenever you gain life, you may pay {w}, If you
do, you may put a +1/+1 counter on target
Vampire you control.