Hex: Ruin

When Hex: Ruin enters the battlefield, put
a -1/-1 counter on target creature.
On the beginning of each of your upkeeps,
put a -1/-1 counter on target creature.
If an opponent sacrifices a creature with
combined mana cost {8} or greater, cleanse.
When you cleanse, sacrifice Hex: Ruin.
A curse is upon you, it will be your ruin.