Mark of Death

At the start of your upkeep, each opponent losses 2 life for each age counter on this card.
Cumulative upkeep, pay 2 life. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay
its upkeep cost for each age counter on it.)
"I woke with it on my arm, and it now always feels cold. I don't think's it's going away."