Crumbling Ashes

Enchantment

At the beginning of your upkeep, destroy target creature with a -1/-1 counter on it.

"I was there to watch my brothers' quenching. I drew the slightest warmth from their dying rage."
—Illulia of Nighthearth

2008-08-01 If the targeted creature loses all its -1/-1 counters by the time the ability resolves, the ability won't resolve because its only target is illegal. The creature won't be destroyed.
2008-08-01 This ability is mandatory. If you're the only player who controls a creature with a -1/-1 counter on it as your upkeep begins, you must target one of your own creatures.
2008-08-01 You can't target a creature unless it already has a -1/-1 counter on it as your upkeep begins. Putting a -1/-1 counter on a creature during your upkeep won't let Crumbling Ashes destroy it that turn.

mtg.wtf