Domineering Sangromancer

Whenever a creature dealt damage by Domineering Sangromancer dies this turn, you may pay {b}{g}. If you do, exile that creature. You may cast creatures exiled this way, and you may spend mana as if it were mana of any type to cast those creatures.
"Death comes for all, dog of Trisenvell. Imagine life eternal, in defense of your people."