Zaralim, Septhis's Reaper

Deathtouch, shroud
As Zaralim enters the battlefield, choose a creature an opponent controls.
At the beginning of your upkeep, if that creature is on the battlefield, it's controller loses life equal to Zaralim's power, then put three +1/+1 counters on Zaralim. Otherwise, sacrifice Zaralim, each opponent loses life equal to his power. You gain that much life.