Child of Hatred

When Child of Hatred dies: Target opponent takes control of Child of Hatred instead.
When you lose control of Child of Hatred you gain 10 life.
When you gain control of Child of Hatred, if you did not summon it this turn, you must pay {5} or lose 10 life.
During your upkeep, you may sacrifice a creature, if you do, Child of Hatred gains +X/+0 until end of turn, where X is the sacrificed creature's converted mana cost.