Lotus Power

Slayer - (when this artifact enters the battlefield
choose a creature type)
Creatures of the chosen type have "Pay 1 life, {t}: add one mana of its mana identity to the
mana pool."
The one thing that is true for every man is that once
he has had a taste of true power, few thins will ever
satisfy him again. He will be willing to sacrifice all of
himself just for the chance to wield it again.