Tuhezhen, the Exalted

Immortal (This creature cannot take damage,
cannot have counters, and cannot change its power
or toughness)
At the beginning of combat on your turn you
may tap Tuhezhen, the Exalted to have target
creature deal damage to itself equal to its power.
If a creature dealt damage this way would die,
exile it and create a 5/5 Black Demon creature
token.