Hydra's Curse

Enchant Creature
Enchanted creature gains vigilance. Put a +0/+1 counter on it. At the start of its controller's
upkeep, double the number of +0/+1 counters
on it. At the start of its controller's end step,
if it's untapped, it deals damage equal to the
number of +0/+1 counters on it to its controller.
Enchanted creature has
"Sacrifice another permanent: {t}"