Mass of Misery

Extort (Whenever you cast a spell, you may pay {b/g}. If you do, each opponent loses 1 life and you gain that much life.)
As long as an opponent has lost 3 or more life this turn, Mass of Misery gets +2/+2.
As long as you have gained 3 or more life this turn, Mass of Misery has trample and menace.
"The mass has one belief: To steal is to gain."