Nixull, Bloodcurdled

+2: Put one blood counter on target creature. On every one of your opponents upkeeps, one blood counter deals 1 damage to that creature.
-8: Exile target permanent except for Nixull, Bloodcurdled. You may pay 3 life every time this ability is used. If you do, change "target" to "all."
-12: Pay 10 life: Target opponent loses the game.