Demonic Mentor

Whenever a opponent would take damage, you
may pay {b/r}{b/r}, that opponent loses 1 extra
life from the source of that damaged.
If a creature that you control dies in combat, you
may pay {b/r} and sacrifice a creature, Demonic
Mentor deals X damage on target creature or
player where X is the sacrified creature's power.
Death is power, power is death. You are both.