Carmilla, Phantom Courtess

when Carmilla, Phantom Courtess enters the battlefield, put a Curse of Blood counter on target creature, planeswalker or player
whenever a target with a Curse of Blood Counter
takes Damage or loses life/loyality, each other
target with a Curse of Blood Counter takes half
that damage or lose half that much life/loyality
{p/b}{p/u}{x}{t} put a Curse of Blood Counter on target creature, planeswalker or player